SF 563203. Replaced 'has_key()' with 'in'.

54 files changed, 243 insertions, 222 deletions

diff --git a/Lib/ConfigParser.py b/Lib/ConfigParser.py
index f457e7256b7..7e30f73df62 100644
--- a/Lib/ConfigParser.py
+++ b/Lib/ConfigParser.py
@@ -191,7 +191,7 @@ class ConfigParser:
         Raise DuplicateSectionError if a section by the specified name
         already exists.
         """
-        if self.__sections.has_key(section):
+        if section in self.__sections:
             raise DuplicateSectionError(section)
         self.__sections[section] = {}
 
@@ -209,7 +209,7 @@ class ConfigParser:
         except KeyError:
             raise NoSectionError(section)
         opts.update(self.__defaults)
-        if opts.has_key('__name__'):
+        if '__name__' in opts:
             del opts['__name__']
         return opts.keys()
 
@@ -310,7 +310,7 @@ class ConfigParser:
         states = {'1': 1, 'yes': 1, 'true': 1, 'on': 1,
                   '0': 0, 'no': 0, 'false': 0, 'off': 0}
         v = self.get(section, option)
-        if not states.has_key(v.lower()):
+        if not v.lower() in states:
             raise ValueError, 'Not a boolean: %s' % v
         return states[v.lower()]
 
@@ -320,12 +320,12 @@ class ConfigParser:
     def has_option(self, section, option):
         """Check for the existence of a given option in a given section."""
         if not section or section == "DEFAULT":
-            return self.__defaults.has_key(option)
+            return option in self.__defaults
         elif not self.has_section(section):
             return 0
         else:
             option = self.optionxform(option)
-            return self.__sections[section].has_key(option)
+            return option in self.__sections[section]
 
     def set(self, section, option, value):
         """Set an option."""
@@ -365,14 +365,14 @@ class ConfigParser:
             except KeyError:
                 raise NoSectionError(section)
         option = self.optionxform(option)
-        existed = sectdict.has_key(option)
+        existed = option in sectdict
         if existed:
             del sectdict[option]
         return existed
 
     def remove_section(self, section):
         """Remove a file section."""
-        if self.__sections.has_key(section):
+        if section in self.__sections:
             del self.__sections[section]
             return True
         else:
@@ -433,7 +433,7 @@ class ConfigParser:
                 mo = self.SECTCRE.match(line)
                 if mo:
                     sectname = mo.group('header')
-                    if self.__sections.has_key(sectname):
+                    if sectname in self.__sections:
                         cursect = self.__sections[sectname]
                     elif sectname == DEFAULTSECT:
                         cursect = self.__defaults
diff --git a/Lib/SimpleHTTPServer.py b/Lib/SimpleHTTPServer.py
index 2caa89dfe0c..f8e3fc53050 100644
--- a/Lib/SimpleHTTPServer.py
+++ b/Lib/SimpleHTTPServer.py
@@ -175,10 +175,10 @@ class SimpleHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
         """
 
         base, ext = posixpath.splitext(path)
-        if self.extensions_map.has_key(ext):
+        if ext in self.extensions_map:
             return self.extensions_map[ext]
         ext = ext.lower()
-        if self.extensions_map.has_key(ext):
+        if ext in self.extensions_map:
             return self.extensions_map[ext]
         else:
             return self.extensions_map['']
diff --git a/Lib/anydbm.py b/Lib/anydbm.py
index 7c75ed173bb..8b01ef3ea49 100644
--- a/Lib/anydbm.py
+++ b/Lib/anydbm.py
@@ -25,7 +25,7 @@ It has the following interface (key and data are strings):
                         # such key)
         del d[key]      # delete data stored at key (raises KeyError
                         # if no such key)
-        flag = d.has_key(key)   # true if the key exists
+        flag = key in d   # true if the key exists
         list = d.keys() # return a list of all existing keys (slow!)
 
 Future versions may change the order in which implementations are
diff --git a/Lib/bdb.py b/Lib/bdb.py
index e1a609a4c3c..b81a9fdc345 100644
--- a/Lib/bdb.py
+++ b/Lib/bdb.py
@@ -103,7 +103,7 @@ class Bdb:
 
     def break_here(self, frame):
         filename = self.canonic(frame.f_code.co_filename)
-        if not self.breaks.has_key(filename):
+        if not filename in self.breaks:
             return False
         lineno = frame.f_lineno
         if not lineno in self.breaks[filename]:
@@ -211,7 +211,7 @@ class Bdb:
         if not line:
             return 'Line %s:%d does not exist' % (filename,
                                    lineno)
-        if not self.breaks.has_key(filename):
+        if not filename in self.breaks:
             self.breaks[filename] = []
         list = self.breaks[filename]
         if not lineno in list:
@@ -220,7 +220,7 @@ class Bdb:
 
     def clear_break(self, filename, lineno):
         filename = self.canonic(filename)
-        if not self.breaks.has_key(filename):
+        if not filename in self.breaks:
             return 'There are no breakpoints in %s' % filename
         if lineno not in self.breaks[filename]:
             return 'There is no breakpoint at %s:%d' % (filename,
@@ -249,7 +249,7 @@ class Bdb:
 
     def clear_all_file_breaks(self, filename):
         filename = self.canonic(filename)
-        if not self.breaks.has_key(filename):
+        if not filename in self.breaks:
             return 'There are no breakpoints in %s' % filename
         for line in self.breaks[filename]:
             blist = Breakpoint.bplist[filename, line]
@@ -267,18 +267,18 @@ class Bdb:
 
     def get_break(self, filename, lineno):
         filename = self.canonic(filename)
-        return self.breaks.has_key(filename) and \
+        return filename in self.breaks and \
             lineno in self.breaks[filename]
 
     def get_breaks(self, filename, lineno):
         filename = self.canonic(filename)
-        return self.breaks.has_key(filename) and \
+        return filename in self.breaks and \
             lineno in self.breaks[filename] and \
             Breakpoint.bplist[filename, lineno] or []
 
     def get_file_breaks(self, filename):
         filename = self.canonic(filename)
-        if self.breaks.has_key(filename):
+        if filename in self.breaks:
             return self.breaks[filename]
         else:
             return []
@@ -316,7 +316,7 @@ class Bdb:
             s = s + frame.f_code.co_name
         else:
             s = s + "<lambda>"
-        if frame.f_locals.has_key('__args__'):
+        if '__args__' in frame.f_locals:
             args = frame.f_locals['__args__']
         else:
             args = None
@@ -324,7 +324,7 @@ class Bdb:
             s = s + repr.repr(args)
         else:
             s = s + '()'
-        if frame.f_locals.has_key('__return__'):
+        if '__return__' in frame.f_locals:
             rv = frame.f_locals['__return__']
             s = s + '->'
             s = s + repr.repr(rv)
diff --git a/Lib/cgi.py b/Lib/cgi.py
index 14ebeb966f7..88d419e0ddf 100755
--- a/Lib/cgi.py
+++ b/Lib/cgi.py
@@ -130,7 +130,7 @@ def parse(fp=None, environ=os.environ, keep_blank_values=0, strict_parsing=0):
     """
     if fp is None:
         fp = sys.stdin
-    if not environ.has_key('REQUEST_METHOD'):
+    if not 'REQUEST_METHOD' in environ:
         environ['REQUEST_METHOD'] = 'GET'       # For testing stand-alone
     if environ['REQUEST_METHOD'] == 'POST':
         ctype, pdict = parse_header(environ['CONTENT_TYPE'])
@@ -143,14 +143,14 @@ def parse(fp=None, environ=os.environ, keep_blank_values=0, strict_parsing=0):
             qs = fp.read(clength)
         else:
             qs = ''                     # Unknown content-type
-        if environ.has_key('QUERY_STRING'):
+        if 'QUERY_STRING' in environ:
             if qs: qs = qs + '&'
             qs = qs + environ['QUERY_STRING']
         elif sys.argv[1:]:
             if qs: qs = qs + '&'
             qs = qs + sys.argv[1]
         environ['QUERY_STRING'] = qs    # XXX Shouldn't, really
-    elif environ.has_key('QUERY_STRING'):
+    elif 'QUERY_STRING' in environ:
         qs = environ['QUERY_STRING']
     else:
         if sys.argv[1:]:
@@ -181,7 +181,7 @@ def parse_qs(qs, keep_blank_values=0, strict_parsing=0):
     """
     dict = {}
     for name, value in parse_qsl(qs, keep_blank_values, strict_parsing):
-        if dict.has_key(name):
+        if name in dict:
             dict[name].append(value)
         else:
             dict[name] = [value]
@@ -244,7 +244,7 @@ def parse_multipart(fp, pdict):
 
     """
     boundary = ""
-    if pdict.has_key('boundary'):
+    if 'boundary' in pdict:
         boundary = pdict['boundary']
     if not valid_boundary(boundary):
         raise ValueError,  ('Invalid boundary in multipart form: %s'
@@ -304,11 +304,11 @@ def parse_multipart(fp, pdict):
         key, params = parse_header(line)
         if key != 'form-data':
             continue
-        if params.has_key('name'):
+        if 'name' in params:
             name = params['name']
         else:
             continue
-        if partdict.has_key(name):
+        if name in partdict:
             partdict[name].append(data)
         else:
             partdict[name] = [data]
@@ -440,10 +440,10 @@ class FieldStorage:
         method = 'GET'
         self.keep_blank_values = keep_blank_values
         self.strict_parsing = strict_parsing
-        if environ.has_key('REQUEST_METHOD'):
+        if 'REQUEST_METHOD' in environ:
             method = environ['REQUEST_METHOD'].upper()
         if method == 'GET' or method == 'HEAD':
-            if environ.has_key('QUERY_STRING'):
+            if 'QUERY_STRING' in environ:
                 qs = environ['QUERY_STRING']
             elif sys.argv[1:]:
                 qs = sys.argv[1]
@@ -458,9 +458,9 @@ class FieldStorage:
             if method == 'POST':
                 # Set default content-type for POST to what's traditional
                 headers['content-type'] = "application/x-www-form-urlencoded"
-            if environ.has_key('CONTENT_TYPE'):
+            if 'CONTENT_TYPE' in environ:
                 headers['content-type'] = environ['CONTENT_TYPE']
-            if environ.has_key('CONTENT_LENGTH'):
+            if 'CONTENT_LENGTH' in environ:
                 headers['content-length'] = environ['CONTENT_LENGTH']
         self.fp = fp or sys.stdin
         self.headers = headers
@@ -468,15 +468,15 @@ class FieldStorage:
 
         # Process content-disposition header
         cdisp, pdict = "", {}
-        if self.headers.has_key('content-disposition'):
+        if 'content-disposition' in self.headers:
             cdisp, pdict = parse_header(self.headers['content-disposition'])
         self.disposition = cdisp
         self.disposition_options = pdict
         self.name = None
-        if pdict.has_key('name'):
+        if 'name' in pdict:
             self.name = pdict['name']
         self.filename = None
-        if pdict.has_key('filename'):
+        if 'filename' in pdict:
             self.filename = pdict['filename']
 
         # Process content-type header
@@ -491,7 +491,7 @@ class FieldStorage:
         #
         # See below for what we do if there does exist a content-type header,
         # but it happens to be something we don't understand.
-        if self.headers.has_key('content-type'):
+        if 'content-type' in self.headers:
             ctype, pdict = parse_header(self.headers['content-type'])
         elif self.outerboundary or method != 'POST':
             ctype, pdict = "text/plain", {}
@@ -500,10 +500,10 @@ class FieldStorage:
         self.type = ctype
         self.type_options = pdict
         self.innerboundary = ""
-        if pdict.has_key('boundary'):
+        if 'boundary' in pdict:
             self.innerboundary = pdict['boundary']
         clen = -1
-        if self.headers.has_key('content-length'):
+        if 'content-length' in self.headers:
             try:
                 clen = int(self.headers['content-length'])
             except ValueError:
@@ -555,7 +555,7 @@ class FieldStorage:
 
     def getvalue(self, key, default=None):
         """Dictionary style get() method, including 'value' lookup."""
-        if self.has_key(key):
+        if key in self:
             value = self[key]
             if type(value) is type([]):
                 return map(lambda v: v.value, value)
@@ -566,7 +566,7 @@ class FieldStorage:
 
     def getfirst(self, key, default=None):
         """ Return the first value received."""
-        if self.has_key(key):
+        if key in self:
             value = self[key]
             if type(value) is type([]):
                 return value[0].value
@@ -577,7 +577,7 @@ class FieldStorage:
 
     def getlist(self, key):
         """ Return list of received values."""
-        if self.has_key(key):
+        if key in self:
             value = self[key]
             if type(value) is type([]):
                 return map(lambda v: v.value, value)
@@ -603,6 +603,14 @@ class FieldStorage:
             if item.name == key: return True
         return False
 
+    def __contains__(self, key):
+        """Dictionary style __contains__ method."""
+        if self.list is None:
+            raise TypeError, "not indexable"
+        for item in self.list:
+            if item.name == key: return True
+        return False
+
     def __len__(self):
         """Dictionary style len(x) support."""
         return len(self.keys())
@@ -770,7 +778,7 @@ class FormContentDict(UserDict.UserDict):
     form = FormContentDict()
 
     form[key] -> [value, value, ...]
-    form.has_key(key) -> Boolean
+    key in form -> Boolean
     form.keys() -> [key, key, ...]
     form.values() -> [[val, val, ...], [val, val, ...], ...]
     form.items() ->  [(key, [val, val, ...]), (key, [val, val, ...]), ...]
@@ -847,21 +855,21 @@ class InterpFormContentDict(SvFormContentDict):
 class FormContent(FormContentDict):
     """This class is present for backwards compatibility only."""
     def values(self, key):
-        if self.dict.has_key(key) :return self.dict[key]
+        if key in self.dict :return self.dict[key]
         else: return None
     def indexed_value(self, key, location):
-        if self.dict.has_key(key):
+        if key in self.dict:
             if len(self.dict[key]) > location:
                 return self.dict[key][location]
             else: return None
         else: return None
     def value(self, key):
-        if self.dict.has_key(key): return self.dict[key][0]
+        if key in self.dict: return self.dict[key][0]
         else: return None
     def length(self, key):
         return len(self.dict[key])
     def stripped(self, key):
-        if self.dict.has_key(key): return self.dict[key][0].strip()
+        if key in self.dict: return self.dict[key][0].strip()
         else: return None
     def pars(self):
         return self.dict
diff --git a/Lib/cmd.py b/Lib/cmd.py
index c4caf5bface..f20c1bb7aa7 100644
--- a/Lib/cmd.py
+++ b/Lib/cmd.py
@@ -304,7 +304,7 @@ class Cmd:
                         continue
                     prevname = name
                     cmd=name[3:]
-                    if help.has_key(cmd):
+                    if cmd in help:
                         cmds_doc.append(cmd)
                         del help[cmd]
                     elif getattr(self, name).__doc__:
diff --git a/Lib/codecs.py b/Lib/codecs.py
index 293d5b7741a..9178db9c3e6 100644
--- a/Lib/codecs.py
+++ b/Lib/codecs.py
@@ -611,7 +611,7 @@ def make_encoding_map(decoding_map):
     """
     m = {}
     for k,v in decoding_map.items():
-        if not m.has_key(v):
+        if not v in m:
             m[v] = k
         else:
             m[v] = None
diff --git a/Lib/copy.py b/Lib/copy.py
index cf0b1af3671..21be6bc3b4f 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -158,7 +158,7 @@ def deepcopy(x, memo = None):
     if memo is None:
         memo = {}
     d = id(x)
-    if memo.has_key(d):
+    if d in memo:
         return memo[d]
     try:
         copierfunction = _deepcopy_dispatch[type(x)]
diff --git a/Lib/difflib.py b/Lib/difflib.py
index 8fd256133cc..0637cffb32c 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -321,7 +321,7 @@ class SequenceMatcher:
                         junkdict[elt] = 1
                         del d[elt]
 
-        # Now for x in b, isjunk(x) == junkdict.has_key(x), but the
+        # Now for x in b, isjunk(x) == x in junkdict, but the
         # latter is much faster.  Note too that while there may be a
         # lot of junk in the sequence, the number of *unique* junk
         # elements is probably small.  So the memory burden of keeping
diff --git a/Lib/doctest.py b/Lib/doctest.py
index 54137c9d177..5cbdd06a9e2 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1015,7 +1015,7 @@ see its docs for details.
 
         d = self.name2ft
         for name, (f, t) in other.name2ft.items():
-            if d.has_key(name):
+            if name in d:
                 print "*** Tester.merge: '" + name + "' in both" \
                     " testers; summing outcomes."
                 f2, t2 = d[name]
@@ -1024,7 +1024,7 @@ see its docs for details.
             d[name] = f, t
 
     def __record_outcome(self, name, f, t):
-        if self.name2ft.has_key(name):
+        if name in self.name2ft:
             print "*** Warning: '" + name + "' was tested before;", \
                 "summing outcomes."
             f2, t2 = self.name2ft[name]
diff --git a/Lib/dospath.py b/Lib/dospath.py
index b4aab497e1d..33d481ccb41 100644
--- a/Lib/dospath.py
+++ b/Lib/dospath.py
@@ -226,7 +226,7 @@ def expanduser(path):
     while i < n and path[i] not in '/\\':
         i = i+1
     if i == 1:
-        if not os.environ.has_key('HOME'):
+        if not 'HOME' in os.environ:
             return path
         userhome = os.environ['HOME']
     else:
@@ -272,7 +272,7 @@ def expandvars(path):
                 try:
                     index = path.index('}')
                     var = path[:index]
-                    if os.environ.has_key(var):
+                    if var in os.environ:
                         res = res + os.environ[var]
                 except ValueError:
                     res = res + path
@@ -285,7 +285,7 @@ def expandvars(path):
                     var = var + c
                     index = index + 1
                     c = path[index:index + 1]
-                if os.environ.has_key(var):
+                if var in os.environ:
                     res = res + os.environ[var]
                 if c != '':
                     res = res + c
diff --git a/Lib/fnmatch.py b/Lib/fnmatch.py
index da0bb34c781..0d3d92c5712 100644
--- a/Lib/fnmatch.py
+++ b/Lib/fnmatch.py
@@ -42,7 +42,7 @@ def filter(names, pat):
     import os,posixpath
     result=[]
     pat=os.path.normcase(pat)
-    if not _cache.has_key(pat):
+    if not pat in _cache:
         res = translate(pat)
         _cache[pat] = re.compile(res)
     match=_cache[pat].match
@@ -64,7 +64,7 @@ def fnmatchcase(name, pat):
     its arguments.
     """
 
-    if not _cache.has_key(pat):
+    if not pat in _cache:
         res = translate(pat)
         _cache[pat] = re.compile(res)
     return _cache[pat].match(name) is not None
diff --git a/Lib/ftplib.py b/Lib/ftplib.py
index 4a3d884eef4..2e5cb337568 100644
--- a/Lib/ftplib.py
+++ b/Lib/ftplib.py
@@ -660,7 +660,7 @@ class Netrc:
 
     def __init__(self, filename=None):
         if filename is None:
-            if os.environ.has_key("HOME"):
+            if "HOME" in os.environ:
                 filename = os.path.join(os.environ["HOME"],
                                         ".netrc")
             else:
@@ -714,7 +714,7 @@ class Netrc:
                 self.__defpasswd = passwd or self.__defpasswd
                 self.__defacct = acct or self.__defacct
             if host:
-                if self.__hosts.has_key(host):
+                if host in self.__hosts:
                     ouser, opasswd, oacct = \
                            self.__hosts[host]
                     user = user or ouser
@@ -736,7 +736,7 @@ class Netrc:
         """
         host = host.lower()
         user = passwd = acct = None
-        if self.__hosts.has_key(host):
+        if host in self.__hosts:
             user, passwd, acct = self.__hosts[host]
         user = user or self.__defuser
         passwd = passwd or self.__defpasswd
diff --git a/Lib/gopherlib.py b/Lib/gopherlib.py
index 03d12ecbb39..fee28bbddff 100644
--- a/Lib/gopherlib.py
+++ b/Lib/gopherlib.py
@@ -45,7 +45,7 @@ def type_to_name(gtype):
         for name in _names:
             if name[:2] == 'A_':
                 _type_to_name_map[eval(name)] = name[2:]
-    if _type_to_name_map.has_key(gtype):
+    if gtype in _type_to_name_map:
         return _type_to_name_map[gtype]
     return 'TYPE=' + `gtype`
 
diff --git a/Lib/httplib.py b/Lib/httplib.py
index 9d018590640..7e308a5200a 100644
--- a/Lib/httplib.py
+++ b/Lib/httplib.py
@@ -549,7 +549,7 @@ class HTTPConnection:
         # If headers already contains a host header, then define the
         # optional skip_host argument to putrequest().  The check is
         # harder because field names are case insensitive.
-        if (headers.has_key('Host')
+        if 'Host' in (headers
             or [k for k in headers.iterkeys() if k.lower() == "host"]):
             self.putrequest(method, url, skip_host=1)
         else:
diff --git a/Lib/ihooks.py b/Lib/ihooks.py
index cf02538a38e..7b00837f3d0 100644
--- a/Lib/ihooks.py
+++ b/Lib/ihooks.py
@@ -175,7 +175,7 @@ class Hooks(_Verbose):
 
     def add_module(self, name):
         d = self.modules_dict()
-        if d.has_key(name): return d[name]
+        if name in d: return d[name]
         d[name] = m = self.new_module(name)
         return m
 
@@ -352,7 +352,7 @@ class BasicModuleImporter(_Verbose):
         return self.loader.set_hooks(hooks)
 
     def import_module(self, name, globals={}, locals={}, fromlist=[]):
-        if self.modules.has_key(name):
+        if name in self.modules:
             return self.modules[name] # Fast path
         stuff = self.loader.find_module(name)
         if not stuff:
@@ -403,10 +403,10 @@ class ModuleImporter(BasicModuleImporter):
         return m
 
     def determine_parent(self, globals):
-        if not globals or not globals.has_key("__name__"):
+        if not globals or not "__name__" in globals:
             return None
         pname = globals['__name__']
-        if globals.has_key("__path__"):
+        if "__path__" in globals:
             parent = self.modules[pname]
             assert globals is parent.__dict__
             return parent
diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index 3ec75a1997b..77bfe9f919f 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -168,16 +168,16 @@ class IMAP4:
                 self._mesg('new IMAP4 connection, tag=%s' % self.tagpre)
 
         self.welcome = self._get_response()
-        if self.untagged_responses.has_key('PREAUTH'):
+        if 'PREAUTH' in self.untagged_responses:
             self.state = 'AUTH'
-        elif self.untagged_responses.has_key('OK'):
+        elif 'OK' in self.untagged_responses:
             self.state = 'NONAUTH'
         else:
             raise self.error(self.welcome)
 
         cap = 'CAPABILITY'
         self._simple_command(cap)
-        if not self.untagged_responses.has_key(cap):
+        if not cap in self.untagged_responses:
             raise self.error('no CAPABILITY response from server')
         self.capabilities = tuple(self.untagged_responses[cap][-1].upper().split())
 
@@ -196,7 +196,7 @@ class IMAP4:
 
     def __getattr__(self, attr):
         #       Allow UPPERCASE variants of IMAP4 command methods.
-        if Commands.has_key(attr):
+        if attr in Commands:
             return getattr(self, attr.lower())
         raise AttributeError("Unknown IMAP4 command: '%s'" % attr)
 
@@ -454,7 +454,7 @@ class IMAP4:
         try: typ, dat = self._simple_command('LOGOUT')
         except: typ, dat = 'NO', ['%s: %s' % sys.exc_info()[:2]]
         self.shutdown()
-        if self.untagged_responses.has_key('BYE'):
+        if 'BYE' in self.untagged_responses:
             return 'BYE', self.untagged_responses['BYE']
         return typ, dat
 
@@ -548,7 +548,7 @@ class IMAP4:
             self.state = 'AUTH'     # Might have been 'SELECTED'
             return typ, dat
         self.state = 'SELECTED'
-        if self.untagged_responses.has_key('READ-ONLY') \
+        if 'READ-ONLY' in self.untagged_responses \
                 and not readonly:
             if __debug__:
                 if self.debug >= 1:
@@ -619,7 +619,7 @@ class IMAP4:
         Returns response appropriate to 'command'.
         """
         command = command.upper()
-        if not Commands.has_key(command):
+        if not command in Commands:
             raise self.error("Unknown IMAP4 UID command: %s" % command)
         if self.state not in Commands[command]:
             raise self.error('command %s illegal in state %s'
@@ -654,7 +654,7 @@ class IMAP4:
         name = name.upper()
         #if not name in self.capabilities:      # Let the server decide!
         #    raise self.error('unknown extension command: %s' % name)
-        if not Commands.has_key(name):
+        if not name in Commands:
             Commands[name] = (self.state,)
         return apply(self._simple_command, (name,) + args)
 
@@ -671,7 +671,7 @@ class IMAP4:
             if self.debug >= 5:
                 self._mesg('untagged_responses[%s] %s += ["%s"]' %
                         (typ, len(ur.get(typ,'')), dat))
-        if ur.has_key(typ):
+        if typ in ur:
             ur[typ].append(dat)
         else:
             ur[typ] = [dat]
@@ -691,10 +691,10 @@ class IMAP4:
             'command %s illegal in state %s' % (name, self.state))
 
         for typ in ('OK', 'NO', 'BAD'):
-            if self.untagged_responses.has_key(typ):
+            if typ in self.untagged_responses:
                 del self.untagged_responses[typ]
 
-        if self.untagged_responses.has_key('READ-ONLY') \
+        if 'READ-ONLY' in self.untagged_responses \
         and not self.is_readonly:
             raise self.readonly('mailbox status changed to READ-ONLY')
 
@@ -782,7 +782,7 @@ class IMAP4:
 
         if self._match(self.tagre, resp):
             tag = self.mo.group('tag')
-            if not self.tagged_commands.has_key(tag):
+            if not tag in self.tagged_commands:
                 raise self.abort('unexpected tagged response: %s' % resp)
 
             typ = self.mo.group('type')
@@ -935,7 +935,7 @@ class IMAP4:
 
         if typ == 'NO':
             return typ, dat
-        if not self.untagged_responses.has_key(name):
+        if not name in self.untagged_responses:
             return typ, [None]
         data = self.untagged_responses[name]
         if __debug__:
diff --git a/Lib/inspect.py b/Lib/inspect.py
index ecd3fc925dc..e40ec8df3b4 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -356,12 +356,12 @@ def getmodule(object):
         file = getabsfile(object)
     except TypeError:
         return None
-    if modulesbyfile.has_key(file):
+    if file in modulesbyfile:
         return sys.modules[modulesbyfile[file]]
     for module in sys.modules.values():
         if hasattr(module, '__file__'):
             modulesbyfile[getabsfile(module)] = module.__name__
-    if modulesbyfile.has_key(file):
+    if file in modulesbyfile:
         return sys.modules[modulesbyfile[file]]
     main = sys.modules['__main__']
     if hasattr(main, object.__name__):
@@ -529,7 +529,7 @@ def walktree(classes, children, parent):
     classes.sort(lambda a, b: cmp(a.__name__, b.__name__))
     for c in classes:
         results.append((c, c.__bases__))
-        if children.has_key(c):
+        if c in children:
             results.append(walktree(children[c], children, c))
     return results
 
@@ -547,7 +547,7 @@ def getclasstree(classes, unique=0):
     for c in classes:
         if c.__bases__:
             for parent in c.__bases__:
-                if not children.has_key(parent):
+                if not parent in children:
                     children[parent] = []
                 children[parent].append(c)
                 if unique and parent in classes: break
diff --git a/Lib/linecache.py b/Lib/linecache.py
index 9953034d515..7a0859d07fe 100644
--- a/Lib/linecache.py
+++ b/Lib/linecache.py
@@ -35,7 +35,7 @@ def getlines(filename):
     """Get the lines for a file from the cache.
     Update the cache if it doesn't contain an entry for this file already."""
 
-    if cache.has_key(filename):
+    if filename in cache:
         return cache[filename][2]
     else:
         return updatecache(filename)
@@ -61,7 +61,7 @@ def updatecache(filename):
     If something's wrong, print a message, discard the cache entry,
     and return an empty list."""
 
-    if cache.has_key(filename):
+    if filename in cache:
         del cache[filename]
     if not filename or filename[0] + filename[-1] == '<>':
         return []
diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index 853949b9956..7afff50012b 100755
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -265,7 +265,7 @@ def _test():
     args = sys.argv[1:]
     if not args:
         for key in 'MAILDIR', 'MAIL', 'LOGNAME', 'USER':
-            if os.environ.has_key(key):
+            if key in os.environ:
                 mbox = os.environ[key]
                 break
         else:
diff --git a/Lib/mailcap.py b/Lib/mailcap.py
index c864852e064..b8ed7597f28 100644
--- a/Lib/mailcap.py
+++ b/Lib/mailcap.py
@@ -25,7 +25,7 @@ def getcaps():
         morecaps = readmailcapfile(fp)
         fp.close()
         for key in morecaps.keys():
-            if not caps.has_key(key):
+            if not key in caps:
                 caps[key] = morecaps[key]
             else:
                 caps[key] = caps[key] + morecaps[key]
@@ -34,11 +34,11 @@ def getcaps():
 def listmailcapfiles():
     """Return a list of all mailcap files found on the system."""
     # XXX Actually, this is Unix-specific
-    if os.environ.has_key('MAILCAPS'):
+    if 'MAILCAPS' in os.environ:
         str = os.environ['MAILCAPS']
         mailcaps = str.split(':')
     else:
-        if os.environ.has_key('HOME'):
+        if 'HOME' in os.environ:
             home = os.environ['HOME']
         else:
             # Don't bother with getpwuid()
@@ -82,7 +82,7 @@ def readmailcapfile(fp):
             types[j] = types[j].strip()
         key = '/'.join(types).lower()
         # Update the database
-        if caps.has_key(key):
+        if key in caps:
             caps[key].append(fields)
         else:
             caps[key] = [fields]
@@ -112,7 +112,7 @@ def parseline(line):
         else:
             fkey = field[:i].strip()
             fvalue = field[i+1:].strip()
-        if fields.has_key(fkey):
+        if fkey in fields:
             # Ignore it
             pass
         else:
@@ -147,7 +147,7 @@ def findmatch(caps, MIMEtype, key='view', filename="/dev/null", plist=[]):
     entries = lookup(caps, MIMEtype, key)
     # XXX This code should somehow check for the needsterminal flag.
     for e in entries:
-        if e.has_key('test'):
+        if 'test' in e:
             test = subst(e['test'], filename, plist)
             if test and os.system(test) != 0:
                 continue
@@ -157,14 +157,14 @@ def findmatch(caps, MIMEtype, key='view', filename="/dev/null", plist=[]):
 
 def lookup(caps, MIMEtype, key=None):
     entries = []
-    if caps.has_key(MIMEtype):
+    if MIMEtype in caps:
         entries = entries + caps[MIMEtype]
     MIMEtypes = MIMEtype.split('/')
     MIMEtype = MIMEtypes[0] + '/*'
-    if caps.has_key(MIMEtype):
+    if MIMEtype in caps:
         entries = entries + caps[MIMEtype]
     if key is not None:
-        entries = filter(lambda e, key=key: e.has_key(key), entries)
+        entries = filter(lambda e, key=key: key in e, entries)
     return entries
 
 def subst(field, MIMEtype, filename, plist=[]):
diff --git a/Lib/mhlib.py b/Lib/mhlib.py
index 8d0eff1861a..d4869c62368 100644
--- a/Lib/mhlib.py
+++ b/Lib/mhlib.py
@@ -375,7 +375,7 @@ class Folder:
                 anchor = self._parseindex(head, all)
             except Error, msg:
                 seqs = self.getsequences()
-                if not seqs.has_key(head):
+                if not head in seqs:
                     if not msg:
                         msg = "bad message list %s" % seq
                     raise Error, msg, sys.exc_info()[2]
@@ -412,7 +412,7 @@ class Folder:
             n = self._parseindex(seq, all)
         except Error, msg:
             seqs = self.getsequences()
-            if not seqs.has_key(seq):
+            if not seq in seqs:
                 if not msg:
                     msg = "bad message list %s" % seq
                 raise Error, msg
diff --git a/Lib/mimetools.py b/Lib/mimetools.py
index d51953908f8..f97787aa6d7 100644
--- a/Lib/mimetools.py
+++ b/Lib/mimetools.py
@@ -142,7 +142,7 @@ def decode(input, output, encoding):
         return uu.decode(input, output)
     if encoding in ('7bit', '8bit'):
         return output.write(input.read())
-    if decodetab.has_key(encoding):
+    if encoding in decodetab:
         pipethrough(input, decodetab[encoding], output)
     else:
         raise ValueError, \
@@ -161,7 +161,7 @@ def encode(input, output, encoding):
         return uu.encode(input, output)
     if encoding in ('7bit', '8bit'):
         return output.write(input.read())
-    if encodetab.has_key(encoding):
+    if encoding in encodetab:
         pipethrough(input, encodetab[encoding], output)
     else:
         raise ValueError, \
diff --git a/Lib/mimetypes.py b/Lib/mimetypes.py
index 5a708e32381..ad13be374ed 100644
--- a/Lib/mimetypes.py
+++ b/Lib/mimetypes.py
@@ -96,24 +96,24 @@ class MimeTypes:
                 type = 'text/plain'
             return type, None           # never compressed, so encoding is None
         base, ext = posixpath.splitext(url)
-        while self.suffix_map.has_key(ext):
+        while ext in self.suffix_map:
             base, ext = posixpath.splitext(base + self.suffix_map[ext])
-        if self.encodings_map.has_key(ext):
+        if ext in self.encodings_map:
             encoding = self.encodings_map[ext]
             base, ext = posixpath.splitext(base)
         else:
             encoding = None
         types_map = self.types_map
         common_types = self.common_types
-        if types_map.has_key(ext):
+        if ext in types_map:
             return types_map[ext], encoding
-        elif types_map.has_key(ext.lower()):
+        elif ext.lower() in types_map:
             return types_map[ext.lower()], encoding
         elif strict:
             return None, encoding
-        elif common_types.has_key(ext):
+        elif ext in common_types:
             return common_types[ext], encoding
-        elif common_types.has_key(ext.lower()):
+        elif ext.lower() in common_types:
             return common_types[ext.lower()], encoding
         else:
             return None, encoding
diff --git a/Lib/netrc.py b/Lib/netrc.py
index b6907d9579e..9ce7efb060b 100644
--- a/Lib/netrc.py
+++ b/Lib/netrc.py
@@ -84,9 +84,9 @@ class netrc:
 
     def authenticators(self, host):
         """Return a (user, account, password) tuple for given host."""
-        if self.hosts.has_key(host):
+        if host in self.hosts:
             return self.hosts[host]
-        elif self.hosts.has_key('default'):
+        elif 'default' in self.hosts:
             return self.hosts['default']
         else:
             return None
diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index 370bd6e0616..7b758d0972d 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -343,9 +343,9 @@ def expanduser(path):
     while i < n and path[i] not in '/\\':
         i = i + 1
     if i == 1:
-        if os.environ.has_key('HOME'):
+        if 'HOME' in os.environ:
             userhome = os.environ['HOME']
-        elif not os.environ.has_key('HOMEPATH'):
+        elif not 'HOMEPATH' in os.environ:
             return path
         else:
             try:
@@ -399,7 +399,7 @@ def expandvars(path):
                 try:
                     index = path.index('}')
                     var = path[:index]
-                    if os.environ.has_key(var):
+                    if var in os.environ:
                         res = res + os.environ[var]
                 except ValueError:
                     res = res + path
@@ -412,7 +412,7 @@ def expandvars(path):
                     var = var + c
                     index = index + 1
                     c = path[index:index + 1]
-                if os.environ.has_key(var):
+                if var in os.environ:
                     res = res + os.environ[var]
                 if c != '':
                     res = res + c
diff --git a/Lib/os.py b/Lib/os.py
index 59f63e2dd86..edffa479fcd 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -333,7 +333,7 @@ def _execvpe(file, args, env=None):
     if head:
         apply(func, (file,) + argrest)
         return
-    if env.has_key('PATH'):
+    if 'PATH' in env:
         envpath = env['PATH']
     else:
         envpath = defpath
@@ -406,7 +406,9 @@ else:
                     unsetenv(key)
                     del self.data[key.upper()]
             def has_key(self, key):
-                return self.data.has_key(key.upper())
+                return key.upper() in self.data
+            def __contains__(self, key):
+                return key.upper() in self.data
             def get(self, key, failobj=None):
                 return self.data.get(key.upper(), failobj)
             def update(self, dict):
diff --git a/Lib/os2emxpath.py b/Lib/os2emxpath.py
index 55f599c4d06..62d5d4023fd 100644
--- a/Lib/os2emxpath.py
+++ b/Lib/os2emxpath.py
@@ -291,9 +291,9 @@ def expanduser(path):
     while i < n and path[i] not in '/\\':
         i = i + 1
     if i == 1:
-        if os.environ.has_key('HOME'):
+        if 'HOME' in os.environ:
             userhome = os.environ['HOME']
-        elif not os.environ.has_key('HOMEPATH'):
+        elif not 'HOMEPATH' in os.environ:
             return path
         else:
             try:
@@ -347,7 +347,7 @@ def expandvars(path):
                 try:
                     index = path.index('}')
                     var = path[:index]
-                    if os.environ.has_key(var):
+                    if var in os.environ:
                         res = res + os.environ[var]
                 except ValueError:
                     res = res + path
@@ -360,7 +360,7 @@ def expandvars(path):
                     var = var + c
                     index = index + 1
                     c = path[index:index + 1]
-                if os.environ.has_key(var):
+                if var in os.environ:
                     res = res + os.environ[var]
                 if c != '':
                     res = res + c
diff --git a/Lib/pdb.py b/Lib/pdb.py
index 75f05560baf..229aa64071b 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -58,7 +58,7 @@ class Pdb(bdb.Bdb, cmd.Cmd):
 
         # Read $HOME/.pdbrc and ./.pdbrc
         self.rcLines = []
-        if os.environ.has_key('HOME'):
+        if 'HOME' in os.environ:
             envHome = os.environ['HOME']
             try:
                 rcFile = open(os.path.join(envHome, ".pdbrc"))
@@ -154,7 +154,7 @@ class Pdb(bdb.Bdb, cmd.Cmd):
         if not line:
             return line
         args = line.split()
-        while self.aliases.has_key(args[0]):
+        while args[0] in self.aliases:
             line = self.aliases[args[0]]
             ii = 1
             for tmpArg in args[1:]:
@@ -509,12 +509,12 @@ class Pdb(bdb.Bdb, cmd.Cmd):
         for i in range(n):
             name = co.co_varnames[i]
             print name, '=',
-            if dict.has_key(name): print dict[name]
+            if name in dict: print dict[name]
             else: print "*** undefined ***"
     do_a = do_args
 
     def do_retval(self, arg):
-        if self.curframe.f_locals.has_key('__return__'):
+        if '__return__' in self.curframe.f_locals:
             print self.curframe.f_locals['__return__']
         else:
             print '*** Not yet returned!'
@@ -614,7 +614,7 @@ class Pdb(bdb.Bdb, cmd.Cmd):
             for alias in keys:
                 print "%s = %s" % (alias, self.aliases[alias])
             return
-        if self.aliases.has_key(args[0]) and len (args) == 1:
+        if args[0] in self.aliases and len (args) == 1:
             print "%s = %s" % (args[0], self.aliases[args[0]])
         else:
             self.aliases[args[0]] = ' '.join(args[1:])
@@ -622,7 +622,7 @@ class Pdb(bdb.Bdb, cmd.Cmd):
     def do_unalias(self, arg):
         args = arg.split()
         if len(args) == 0: return
-        if self.aliases.has_key(args[0]):
+        if args[0] in self.aliases:
             del self.aliases[args[0]]
 
     # Print a traceback starting at the top stack frame.
diff --git a/Lib/pickle.py b/Lib/pickle.py
index 985b851877f..f29df510a27 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -206,7 +206,7 @@ class Pickler:
                 self.save_tuple(object)
             return
 
-        if memo.has_key(d):
+        if d in memo:
             self.write(self.get(memo[d][0]))
             return
 
@@ -430,7 +430,7 @@ class Pickler:
         for element in object:
             save(element)
 
-        if len(object) and memo.has_key(d):
+        if len(object) and d in memo:
             if self.bin:
                 write(POP_MARK + self.get(memo[d][0]))
                 return
@@ -620,7 +620,7 @@ def whichmodule(cls, clsname):
     Return a module name.
     If the class cannot be found, return __main__.
     """
-    if classmap.has_key(cls):
+    if cls in classmap:
         return classmap[cls]
 
     for name, module in sys.modules.items():
@@ -913,7 +913,7 @@ class Unpickler:
         del stack[-2:]
 
         if type(callable) is not ClassType:
-            if not safe_constructors.has_key(callable):
+            if not callable in safe_constructors:
                 try:
                     safe = callable.__safe_for_unpickling__
                 except AttributeError:
diff --git a/Lib/posixpath.py b/Lib/posixpath.py
index 0b984f6da77..a81f508ce17 100644
--- a/Lib/posixpath.py
+++ b/Lib/posixpath.py
@@ -305,7 +305,7 @@ def expanduser(path):
     while i < n and path[i] != '/':
         i = i + 1
     if i == 1:
-        if not os.environ.has_key('HOME'):
+        if not 'HOME' in os.environ:
             return path
         userhome = os.environ['HOME']
     else:
@@ -343,7 +343,7 @@ def expandvars(path):
         name = m.group(1)
         if name[:1] == '{' and name[-1:] == '}':
             name = name[1:-1]
-        if os.environ.has_key(name):
+        if name in os.environ:
             tail = path[j:]
             path = path[:i] + os.environ[name]
             i = len(path)
diff --git a/Lib/profile.py b/Lib/profile.py
index 82b9bfe5958..fa3527f03f7 100755
--- a/Lib/profile.py
+++ b/Lib/profile.py
@@ -268,7 +268,7 @@ class Profile:
         fn = (fcode.co_filename, fcode.co_firstlineno, fcode.co_name)
         self.cur = (t, 0, 0, fn, frame, self.cur)
         timings = self.timings
-        if timings.has_key(fn):
+        if fn in timings:
             cc, ns, tt, ct, callers = timings[fn]
             timings[fn] = cc, ns + 1, tt, ct, callers
         else:
@@ -300,7 +300,7 @@ class Profile:
             ct = ct + frame_total
             cc = cc + 1
 
-        if callers.has_key(pfn):
+        if pfn in callers:
             callers[pfn] = callers[pfn] + 1  # hack: gather more
             # stats such as the amount of time added to ct courtesy
             # of this specific call, and the contribution to cc
diff --git a/Lib/pstats.py b/Lib/pstats.py
index f74bd15ade1..126d0beec6d 100644
--- a/Lib/pstats.py
+++ b/Lib/pstats.py
@@ -151,7 +151,7 @@ class Stats:
         self.fcn_list = None
 
         for func in other.stats.keys():
-            if self.stats.has_key(func):
+            if func in self.stats:
                 old_func_stat = self.stats[func]
             else:
                 old_func_stat = (0, 0, 0, 0, {},)
@@ -183,7 +183,7 @@ class Stats:
                 while fragment:
                     if not fragment:
                         break
-                    if dict.has_key(fragment):
+                    if fragment in dict:
                         bad_list[fragment] = 0
                         break
                     dict[fragment] = self.sort_arg_dict_default[word]
@@ -243,7 +243,7 @@ class Stats:
             for func2 in callers.keys():
                 newcallers[func_strip_path(func2)] = callers[func2]
 
-            if newstats.has_key(newfunc):
+            if newfunc in newstats:
                 newstats[newfunc] = add_func_stats(
                                         newstats[newfunc],
                                         (cc, nc, tt, ct, newcallers))
@@ -264,11 +264,11 @@ class Stats:
         if self.all_callees: return
         self.all_callees = all_callees = {}
         for func in self.stats.keys():
-            if not all_callees.has_key(func):
+            if not func in all_callees:
                 all_callees[func] = {}
             cc, nc, tt, ct, callers = self.stats[func]
             for func2 in callers.keys():
-                if not all_callees.has_key(func2):
+                if not func2 in all_callees:
                     all_callees[func2] = {}
                 all_callees[func2][func]  = callers[func2]
         return
@@ -354,7 +354,7 @@ class Stats:
 
             self.print_call_heading(width, "called...")
             for func in list:
-                if self.all_callees.has_key(func):
+                if func in self.all_callees:
                     self.print_call_line(width, func, self.all_callees[func])
                 else:
                     self.print_call_line(width, func, {})
@@ -471,7 +471,7 @@ def add_callers(target, source):
     for func in target.keys():
         new_callers[func] = target[func]
     for func in source.keys():
-        if new_callers.has_key(func):
+        if func in new_callers:
             new_callers[func] = source[func] + new_callers[func]
         else:
             new_callers[func] = source[func]
diff --git a/Lib/pyclbr.py b/Lib/pyclbr.py
index 31fad46219b..29b8354e4e0 100644
--- a/Lib/pyclbr.py
+++ b/Lib/pyclbr.py
@@ -171,7 +171,7 @@ def readmodule_ex(module, path=[], inpackage=0):
         child = readmodule_ex(submodule, parent['__path__'], 1)
         return child
 
-    if _modules.has_key(module):
+    if module in _modules:
         # we've seen this module before...
         return _modules[module]
     if module in sys.builtin_module_names:
@@ -265,7 +265,7 @@ def readmodule_ex(module, path=[], inpackage=0):
                 names = []
                 for n in inherit.split(','):
                     n = n.strip()
-                    if dict.has_key(n):
+                    if n in dict:
                         # we know this super class
                         n = dict[n]
                     else:
@@ -278,9 +278,9 @@ def readmodule_ex(module, path=[], inpackage=0):
                             # module for class
                             m = c[-2]
                             c = c[-1]
-                            if _modules.has_key(m):
+                            if m in _modules:
                                 d = _modules[m]
-                                if d.has_key(c):
+                                if c in d:
                                     n = d[c]
                     names.append(n)
                 inherit = names
@@ -316,7 +316,7 @@ def readmodule_ex(module, path=[], inpackage=0):
             # were mentioned in the list
             for n in names:
                 n = n.strip()
-                if d.has_key(n):
+                if n in d:
                     dict[n] = d[n]
                 elif n == '*':
                     # only add a name if not
@@ -326,7 +326,7 @@ def readmodule_ex(module, path=[], inpackage=0):
                     # start with _
                     for n in d.keys():
                         if n[0] != '_' and \
-                           not dict.has_key(n):
+                           not n in dict:
                             dict[n] = d[n]
         else:
             assert 0, "regexp _getnext found something unexpected"
diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 4cff5f3a37a..8bb4c7b9a71 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -223,7 +223,7 @@ def safeimport(path, forceload=0, cache={}):
     package path is specified, the module at the end of the path is returned,
     not the package at the beginning.  If the optional 'forceload' argument
     is 1, we reload the module from disk (unless it's a dynamic extension)."""
-    if forceload and sys.modules.has_key(path):
+    if forceload and path in sys.modules:
         # This is the only way to be sure.  Checking the mtime of the file
         # isn't good enough (e.g. what if the module contains a class that
         # inherits from another module that has changed?).
@@ -241,7 +241,7 @@ def safeimport(path, forceload=0, cache={}):
     except:
         # Did the error occur before or after the module was found?
         (exc, value, tb) = info = sys.exc_info()
-        if sys.modules.has_key(path):
+        if path in sys.modules:
             # An error occured while executing the imported module.
             raise ErrorDuringImport(sys.modules[path].__file__, info)
         elif exc is SyntaxError:
@@ -403,7 +403,7 @@ TT { font-family: lucidatypewriter, lucida console, courier }
     def namelink(self, name, *dicts):
         """Make a link for an identifier, given name-to-URL mappings."""
         for dict in dicts:
-            if dict.has_key(name):
+            if name in dict:
                 return '<a href="%s">%s</a>' % (dict[name], name)
         return name
 
@@ -536,7 +536,7 @@ TT { font-family: lucidatypewriter, lucida console, courier }
                 module = sys.modules.get(modname)
                 if modname != name and module and hasattr(module, key):
                     if getattr(module, key) is base:
-                        if not cdict.has_key(key):
+                        if not key in cdict:
                             cdict[key] = cdict[base] = modname + '.html#' + key
         funcs, fdict = [], {}
         for key, value in inspect.getmembers(object, inspect.isroutine):
@@ -778,7 +778,7 @@ TT { font-family: lucidatypewriter, lucida console, courier }
         if name == realname:
             title = '<a name="%s"><strong>%s</strong></a>' % (anchor, realname)
         else:
-            if (cl and cl.__dict__.has_key(realname) and
+            if (cl and realname in cl.__dict__ and
                 cl.__dict__[realname] is object):
                 reallink = '<a href="#%s">%s</a>' % (
                     cl.__name__ + '-' + realname, realname)
@@ -822,8 +822,8 @@ TT { font-family: lucidatypewriter, lucida console, courier }
 
         def found(name, ispackage,
                   modpkgs=modpkgs, shadowed=shadowed, seen=seen):
-            if not seen.has_key(name):
-                modpkgs.append((name, '', ispackage, shadowed.has_key(name)))
+            if not name in seen:
+                modpkgs.append((name, '', ispackage, name)) in shadowed
                 seen[name] = 1
                 shadowed[name] = 1
 
@@ -1140,7 +1140,7 @@ class TextDoc(Doc):
         if name == realname:
             title = self.bold(realname)
         else:
-            if (cl and cl.__dict__.has_key(realname) and
+            if (cl and realname in cl.__dict__ and
                 cl.__dict__[realname] is object):
                 skipdocs = 1
             title = self.bold(name) + ' = ' + realname
@@ -1189,7 +1189,7 @@ def getpager():
         return plainpager
     if os.environ.get('TERM') in ['dumb', 'emacs']:
         return plainpager
-    if os.environ.has_key('PAGER'):
+    if 'PAGER' in os.environ:
         if sys.platform == 'win32': # pipes completely broken in Windows
             return lambda text: tempfilepager(plain(text), os.environ['PAGER'])
         elif os.environ.get('TERM') in ['dumb', 'emacs']:
@@ -1375,7 +1375,7 @@ def writedocs(dir, pkgpath='', done=None):
             modname = inspect.getmodulename(path)
             if modname:
                 modname = pkgpath + modname
-                if not done.has_key(modname):
+                if not modname in done:
                     done[modname] = 1
                     writedoc(modname)
 
@@ -1546,8 +1546,8 @@ has the same effect as typing a particular string at the help> prompt.
             elif request == 'modules': self.listmodules()
             elif request[:8] == 'modules ':
                 self.listmodules(split(request)[1])
-            elif self.keywords.has_key(request): self.showtopic(request)
-            elif self.topics.has_key(request): self.showtopic(request)
+            elif request in self.keywords: self.showtopic(request)
+            elif request in self.topics: self.showtopic(request)
             elif request: doc(request, 'Help on %s:')
         elif isinstance(request, Helper): self()
         else: doc(request, 'Help on %s:')
@@ -1740,7 +1740,7 @@ class ModuleScanner(Scanner):
             modname = inspect.getmodulename(path)
             if os.path.isfile(path) and modname:
                 modname = package + (package and '.') + modname
-                if not seen.has_key(modname):
+                if not modname in seen:
                     seen[modname] = 1 # if we see spam.py, skip spam.pyc
                     if key is None:
                         callback(path, modname, '')
diff --git a/Lib/regsub.py b/Lib/regsub.py
index a86819f58fa..9b8fae5854f 100644
--- a/Lib/regsub.py
+++ b/Lib/regsub.py
@@ -134,7 +134,7 @@ def compile(pat):
     if type(pat) != type(''):
         return pat              # Assume it is a compiled regex
     key = (pat, regex.get_syntax())
-    if cache.has_key(key):
+    if key in cache:
         prog = cache[key]       # Get it from the cache
     else:
         prog = cache[key] = regex.compile(pat)
diff --git a/Lib/rexec.py b/Lib/rexec.py
index 04ff405fcf0..623cc976653 100644
--- a/Lib/rexec.py
+++ b/Lib/rexec.py
@@ -206,7 +206,7 @@ class RExec(ihooks._Verbose):
     def load_dynamic(self, name, filename, file):
         if name not in self.ok_dynamic_modules:
             raise ImportError, "untrusted dynamic module: %s" % name
-        if sys.modules.has_key(name):
+        if name in sys.modules:
             src = sys.modules[name]
         else:
             src = imp.load_dynamic(name, filename, file)
@@ -288,7 +288,7 @@ class RExec(ihooks._Verbose):
     # Add a module -- return an existing module or create one
 
     def add_module(self, mname):
-        if self.modules.has_key(mname):
+        if mname in self.modules:
             return self.modules[mname]
         self.modules[mname] = m = self.hooks.new_module(mname)
         m.__builtins__ = self.modules['__builtin__']
diff --git a/Lib/rfc822.py b/Lib/rfc822.py
index 0ce546ced77..6495f5f336b 100644
--- a/Lib/rfc822.py
+++ b/Lib/rfc822.py
@@ -406,7 +406,7 @@ class Message:
     def __delitem__(self, name):
         """Delete all occurrences of a specific header, if it is present."""
         name = name.lower()
-        if not self.dict.has_key(name):
+        if not name in self.dict:
             return
         del self.dict[name]
         name = name + ':'
@@ -427,14 +427,14 @@ class Message:
 
     def get(self, name, default=""):
         name = name.lower()
-        if self.dict.has_key(name):
+        if name in self.dict:
             return self.dict[name]
         else:
             return default
 
     def setdefault(self, name, default=""):
         lowername = name.lower()
-        if self.dict.has_key(lowername):
+        if lowername in self.dict:
             return self.dict[lowername]
         else:
             text = name + ": " + default
@@ -446,7 +446,11 @@ class Message:
 
     def has_key(self, name):
         """Determine whether a message contains the named header."""
-        return self.dict.has_key(name.lower())
+        return name.lower() in self.dict
+
+    def __contains__(self, name):
+        """Determine whether a message contains the named header."""
+        return name.lower() in self.dict        
 
     def keys(self):
         """Get all of a message's header field names."""
@@ -919,7 +923,7 @@ def parsedate_tz(data):
         return None
     tzoffset = None
     tz = tz.upper()
-    if _timezones.has_key(tz):
+    if tz in _timezones:
         tzoffset = _timezones[tz]
     else:
         try:
@@ -1010,8 +1014,8 @@ if __name__ == '__main__':
     print 'Lines:', n
     print '-'*70
     print 'len =', len(m)
-    if m.has_key('Date'): print 'Date =', m['Date']
-    if m.has_key('X-Nonsense'): pass
+    if 'Date' in m: print 'Date =', m['Date']
+    if 'X-Nonsense' in m: pass
     print 'keys =', m.keys()
     print 'values =', m.values()
     print 'items =', m.items()
diff --git a/Lib/sgmllib.py b/Lib/sgmllib.py
index 1db5423254c..bdca8a60b73 100644
--- a/Lib/sgmllib.py
+++ b/Lib/sgmllib.py
@@ -396,7 +396,7 @@ class SGMLParser(markupbase.ParserBase):
         tailored by setting up the self.entitydefs mapping appropriately.
         """
         table = self.entitydefs
-        if table.has_key(name):
+        if name in table:
             self.handle_data(table[name])
         else:
             self.unknown_entityref(name)
diff --git a/Lib/site.py b/Lib/site.py
index 770eb5291ce..23c12a09ee9 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -84,7 +84,7 @@ for dir in sys.path:
         if dir and not os.path.exists(dir):
             continue
     dir, dircase = makepath(dir)
-    if not _dirs_in_sys_path.has_key(dircase):
+    if not dircase in _dirs_in_sys_path:
         L.append(dir)
         _dirs_in_sys_path[dircase] = 1
 sys.path[:] = L
@@ -116,7 +116,7 @@ def addsitedir(sitedir):
     else:
         reset = 0
     sitedir, sitedircase = makepath(sitedir)
-    if not _dirs_in_sys_path.has_key(sitedircase):
+    if not sitedircase in _dirs_in_sys_path:
         sys.path.append(sitedir)        # Add path component
     try:
         names = os.listdir(sitedir)
@@ -153,7 +153,7 @@ def addpackage(sitedir, name):
         if dir[-1] == '\n':
             dir = dir[:-1]
         dir, dircase = makepath(sitedir, dir)
-        if not _dirs_in_sys_path.has_key(dircase) and os.path.exists(dir):
+        if not dircase in _dirs_in_sys_path and os.path.exists(dir):
             sys.path.append(dir)
             _dirs_in_sys_path[dircase] = 1
     if reset:
diff --git a/Lib/smtplib.py b/Lib/smtplib.py
index 80e6508281d..62b19bd5efa 100755
--- a/Lib/smtplib.py
+++ b/Lib/smtplib.py
@@ -411,7 +411,7 @@ class SMTP:
 
     def has_extn(self, opt):
         """Does the server support a given SMTP service extension?"""
-        return self.esmtp_features.has_key(opt.lower())
+        return opt.lower() in self.esmtp_features
 
     def help(self, args=''):
         """SMTP 'help' command.
diff --git a/Lib/sre_parse.py b/Lib/sre_parse.py
index 1aba45645a2..a5a8831319d 100644
--- a/Lib/sre_parse.py
+++ b/Lib/sre_parse.py
@@ -568,9 +568,9 @@ def _parse(source, state):
                     continue
                 else:
                     # flags
-                    if not FLAGS.has_key(source.next):
+                    if not source.next in FLAGS:
                         raise error, "unexpected end of pattern"
-                    while FLAGS.has_key(source.next):
+                    while source.next in FLAGS:
                         state.flags = state.flags | FLAGS[source.get()]
             if group:
                 # parse group contents
diff --git a/Lib/statcache.py b/Lib/statcache.py
index cfc812bd752..551069bbe66 100644
--- a/Lib/statcache.py
+++ b/Lib/statcache.py
@@ -16,7 +16,7 @@ __all__ = ["stat","reset","forget","forget_prefix","forget_dir",
 
 # The cache.  Keys are pathnames, values are os.stat outcomes.
 # Remember that multiple threads may be calling this!  So, e.g., that
-# cache.has_key(path) returns 1 doesn't mean the cache will still contain
+# path in cache returns 1 doesn't mean the cache will still contain
 # path on the next line.  Code defensively.
 
 cache = {}
diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index 74922405a1b..eb8253c9103 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -63,7 +63,7 @@ def _gettempdir_inner():
         if scrapdir:
             attempdirs.insert(0, scrapdir)
     for envname in 'TMPDIR', 'TEMP', 'TMP':
-        if os.environ.has_key(envname):
+        if envname in os.environ:
             attempdirs.insert(0, os.environ[envname])
     testfile = gettempprefix() + 'test'
     for dir in attempdirs:
diff --git a/Lib/toaiff.py b/Lib/toaiff.py
index f0c5c86a7f6..cf0bfc8c863 100644
--- a/Lib/toaiff.py
+++ b/Lib/toaiff.py
@@ -95,7 +95,7 @@ def _toaiff(filename, temps):
         raise error, filename + ': ' + msg
     if ftype == 'aiff':
         return fname
-    if ftype is None or not table.has_key(ftype):
+    if ftype is None or not ftype in table:
         raise error, \
                 filename + ': unsupported audio file type ' + `ftype`
     temp = tempfile.mktemp()
diff --git a/Lib/urllib.py b/Lib/urllib.py
index eb7e496c822..b248b8afbdd 100644
--- a/Lib/urllib.py
+++ b/Lib/urllib.py
@@ -153,14 +153,14 @@ class URLopener:
     def open(self, fullurl, data=None):
         """Use URLopener().open(file) instead of open(file, 'r')."""
         fullurl = unwrap(toBytes(fullurl))
-        if self.tempcache and self.tempcache.has_key(fullurl):
+        if self.tempcache and fullurl in self.tempcache:
             filename, headers = self.tempcache[fullurl]
             fp = open(filename, 'rb')
             return addinfourl(fp, headers, fullurl)
         urltype, url = splittype(fullurl)
         if not urltype:
             urltype = 'file'
-        if self.proxies.has_key(urltype):
+        if urltype in self.proxies:
             proxy = self.proxies[urltype]
             urltype, proxyhost = splittype(proxy)
             host, selector = splithost(proxyhost)
@@ -200,7 +200,7 @@ class URLopener:
         """retrieve(url) returns (filename, None) for a local object
         or (tempfilename, headers) for a remote object."""
         url = unwrap(toBytes(url))
-        if self.tempcache and self.tempcache.has_key(url):
+        if self.tempcache and url in self.tempcache:
             return self.tempcache[url]
         type, url1 = splittype(url)
         if not filename and (not type or type == 'file'):
@@ -230,7 +230,7 @@ class URLopener:
         size = -1
         blocknum = 1
         if reporthook:
-            if headers.has_key("content-length"):
+            if "content-length" in headers:
                 size = int(headers["Content-Length"])
             reporthook(0, bs, size)
         block = fp.read(bs)
@@ -473,7 +473,7 @@ class URLopener:
                     del self.ftpcache[k]
                     v.close()
         try:
-            if not self.ftpcache.has_key(key):
+            if not key in self.ftpcache:
                 self.ftpcache[key] = \
                     ftpwrapper(user, passwd, host, port, dirs)
             if not file: type = 'D'
@@ -566,9 +566,9 @@ class FancyURLopener(URLopener):
         return result
 
     def redirect_internal(self, url, fp, errcode, errmsg, headers, data):
-        if headers.has_key('location'):
+        if 'location' in headers:
             newurl = headers['location']
-        elif headers.has_key('uri'):
+        elif 'uri' in headers:
             newurl = headers['uri']
         else:
             return
@@ -589,7 +589,7 @@ class FancyURLopener(URLopener):
         """Error 401 -- authentication required.
         See this URL for a description of the basic authentication scheme:
         http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-v10-spec-00.txt"""
-        if not headers.has_key('www-authenticate'):
+        if not 'www-authenticate' in headers:
             URLopener.http_error_default(self, url, fp,
                                          errcode, errmsg, headers)
         stuff = headers['www-authenticate']
@@ -633,7 +633,7 @@ class FancyURLopener(URLopener):
 
     def get_user_passwd(self, host, realm, clear_cache = 0):
         key = realm + '@' + host.lower()
-        if self.auth_cache.has_key(key):
+        if key in self.auth_cache:
             if clear_cache:
                 del self.auth_cache[key]
             else:
@@ -1108,7 +1108,7 @@ def _fast_quote(s):
     res = list(s)
     for i in range(len(res)):
         c = res[i]
-        if not _fast_safe.has_key(c):
+        if not c in _fast_safe:
             res[i] = '%%%02X' % ord(c)
     return ''.join(res)
 
@@ -1253,7 +1253,7 @@ if os.name == 'mac':
             return {}
         proxies = {}
         # HTTP:
-        if config.has_key('UseHTTPProxy') and config['UseHTTPProxy']:
+        if 'UseHTTPProxy' in config and config['UseHTTPProxy']:
             try:
                 value = config['HTTPProxyHost']
             except ic.error:
diff --git a/Lib/urllib2.py b/Lib/urllib2.py
index f5a2f320681..898da7dde58 100644
--- a/Lib/urllib2.py
+++ b/Lib/urllib2.py
@@ -255,7 +255,7 @@ class OpenerDirector:
         for meth in dir(handler):
             if meth[-5:] == '_open':
                 protocol = meth[:-5]
-                if self.handle_open.has_key(protocol):
+                if protocol in self.handle_open:
                     self.handle_open[protocol].append(handler)
                 else:
                     self.handle_open[protocol] = [handler]
@@ -271,7 +271,7 @@ class OpenerDirector:
                 except ValueError:
                     pass
                 dict = self.handle_error.get(proto, {})
-                if dict.has_key(kind):
+                if kind in dict:
                     dict[kind].append(handler)
                 else:
                     dict[kind] = [handler]
@@ -404,9 +404,9 @@ class HTTPRedirectHandler(BaseHandler):
     # have already seen.  Do this by adding a handler-specific
     # attribute to the Request object.
     def http_error_302(self, req, fp, code, msg, headers):
-        if headers.has_key('location'):
+        if 'location' in headers:
             newurl = headers['location']
-        elif headers.has_key('uri'):
+        elif 'uri' in headers:
             newurl = headers['uri']
         else:
             return
@@ -419,7 +419,7 @@ class HTTPRedirectHandler(BaseHandler):
         new.error_302_dict = {}
         if hasattr(req, 'error_302_dict'):
             if len(req.error_302_dict)>10 or \
-               req.error_302_dict.has_key(newurl):
+               newurl in req.error_302_dict:
                 raise HTTPError(req.get_full_url(), code,
                                 self.inf_msg + msg, headers, fp)
             new.error_302_dict.update(req.error_302_dict)
@@ -505,7 +505,7 @@ class CustomProxyHandler(BaseHandler):
         return self.parent.open(req)
 
     def add_proxy(self, cpo):
-        if self.proxies.has_key(cpo.proto):
+        if cpo.proto in self.proxies:
             self.proxies[cpo.proto].append(cpo)
         else:
             self.proxies[cpo.proto] = [cpo]
@@ -519,7 +519,7 @@ class HTTPPasswordMgr:
         if isinstance(uri, types.StringTypes):
             uri = [uri]
         uri = tuple(map(self.reduce_uri, uri))
-        if not self.passwd.has_key(realm):
+        if not realm in self.passwd:
             self.passwd[realm] = {}
         self.passwd[realm][uri] = (user, passwd)
 
@@ -751,10 +751,10 @@ class AbstractHTTPHandler(BaseHandler):
             if req.has_data():
                 data = req.get_data()
                 h.putrequest('POST', req.get_selector())
-                if not req.headers.has_key('Content-type'):
+                if not 'Content-type' in req.headers:
                     h.putheader('Content-type',
                                 'application/x-www-form-urlencoded')
-                if not req.headers.has_key('Content-length'):
+                if not 'Content-length' in req.headers:
                     h.putheader('Content-length', '%d' % len(data))
             else:
                 h.putrequest('GET', req.get_selector())
@@ -954,7 +954,7 @@ class CacheFTPHandler(FTPHandler):
 
     def connect_ftp(self, user, passwd, host, port, dirs):
         key = user, passwd, host, port
-        if self.cache.has_key(key):
+        if key in self.cache:
             self.timeout[key] = time.time() + self.delay
         else:
             self.cache[key] = ftpwrapper(user, passwd, host, port, dirs)
diff --git a/Lib/user.py b/Lib/user.py
index ee8ed88d638..d0cb3ed3df2 100644
--- a/Lib/user.py
+++ b/Lib/user.py
@@ -24,11 +24,11 @@ wishes to do different things depending on the Python version.
 import os
 
 home = os.curdir                        # Default
-if os.environ.has_key('HOME'):
+if 'HOME' in os.environ:
     home = os.environ['HOME']
 elif os.name == 'nt':                   # Contributed by Jeff Bauer
-    if os.environ.has_key('HOMEPATH'):
-        if os.environ.has_key('HOMEDRIVE'):
+    if 'HOMEPATH' in os.environ:
+        if 'HOMEDRIVE' in os.environ:
             home = os.environ['HOMEDRIVE'] + os.environ['HOMEPATH']
         else:
             home = os.environ['HOMEPATH']
diff --git a/Lib/warnings.py b/Lib/warnings.py
index fc6154f8838..dcedddea53b 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -27,7 +27,7 @@ def warn(message, category=None, stacklevel=1):
     else:
         globals = caller.f_globals
         lineno = caller.f_lineno
-    if globals.has_key('__name__'):
+    if '__name__' in globals:
         module = globals['__name__']
     else:
         module = "<string>"
diff --git a/Lib/weakref.py b/Lib/weakref.py
index 967458d989d..70d36fa3b98 100644
--- a/Lib/weakref.py
+++ b/Lib/weakref.py
@@ -183,8 +183,15 @@ class WeakKeyDictionary(UserDict.UserDict):
             wr = ref(key)
         except TypeError:
             return 0
-        return self.data.has_key(wr)
+        return wr in self.data
 
+    def __contains__(self, key):
+        try:
+            wr = ref(key)
+        except TypeError:
+            return 0
+        return wr in self.data
+    
     def items(self):
         L = []
         for key, value in self.data.items():
diff --git a/Lib/webbrowser.py b/Lib/webbrowser.py
index 1509b7aa856..5254289301c 100644
--- a/Lib/webbrowser.py
+++ b/Lib/webbrowser.py
@@ -312,19 +312,19 @@ if sys.platform[:3] == "os2" and _iscommand("netscape.exe"):
 # OK, now that we know what the default preference orders for each
 # platform are, allow user to override them with the BROWSER variable.
 #
-if os.environ.has_key("BROWSER"):
+if "BROWSER" in os.environ:
     # It's the user's responsibility to register handlers for any unknown
     # browser referenced by this value, before calling open().
     _tryorder = os.environ["BROWSER"].split(os.pathsep)
 
 for cmd in _tryorder:
-    if not _browsers.has_key(cmd.lower()):
+    if not cmd.lower() in _browsers:
         if _iscommand(cmd.lower()):
             register(cmd.lower(), None, GenericBrowser(
                 "%s '%%s'" % cmd.lower()))
 cmd = None # to make del work if _tryorder was empty
 del cmd
 
-_tryorder = filter(lambda x: _browsers.has_key(x.lower())
+_tryorder = filter(lambda x: x.lower() in _browsers
                    or x.find("%s") > -1, _tryorder)
 # what to do if _tryorder is now empty?
diff --git a/Lib/xmllib.py b/Lib/xmllib.py
index 445ab139456..c261a2636cd 100644
--- a/Lib/xmllib.py
+++ b/Lib/xmllib.py
@@ -102,15 +102,15 @@ class XMLParser:
     # Interface -- initialize and reset this instance
     def __init__(self, **kw):
         self.__fixed = 0
-        if kw.has_key('accept_unquoted_attributes'):
+        if 'accept_unquoted_attributes' in kw:
             self.__accept_unquoted_attributes = kw['accept_unquoted_attributes']
-        if kw.has_key('accept_missing_endtag_name'):
+        if 'accept_missing_endtag_name' in kw:
             self.__accept_missing_endtag_name = kw['accept_missing_endtag_name']
-        if kw.has_key('map_case'):
+        if 'map_case' in kw:
             self.__map_case = kw['map_case']
-        if kw.has_key('accept_utf8'):
+        if 'accept_utf8' in kw:
             self.__accept_utf8 = kw['accept_utf8']
-        if kw.has_key('translate_attribute_references'):
+        if 'translate_attribute_references' in kw:
             self.__translate_attribute_references = kw['translate_attribute_references']
         self.reset()
 
@@ -206,7 +206,7 @@ class XMLParser:
                     self.syntax_error("`;' missing after char reference")
                     i = i-1
             elif all:
-                if self.entitydefs.has_key(str):
+                if str in self.entitydefs:
                     str = self.entitydefs[str]
                     rescan = 1
                 elif data[i - 1] != ';':
@@ -375,7 +375,7 @@ class XMLParser:
                     name = res.group('name')
                     if self.__map_case:
                         name = name.lower()
-                    if self.entitydefs.has_key(name):
+                    if name in self.entitydefs:
                         self.rawdata = rawdata = rawdata[:res.start(0)] + self.entitydefs[name] + rawdata[i:]
                         n = len(rawdata)
                         i = res.start(0)
@@ -533,15 +533,15 @@ class XMLParser:
             if namespace:
                 self.syntax_error('namespace declaration inside namespace declaration')
             for attrname in attrdict.keys():
-                if not self.__xml_namespace_attributes.has_key(attrname):
+                if not attrname in self.__xml_namespace_attributes:
                     self.syntax_error("unknown attribute `%s' in xml:namespace tag" % attrname)
-            if not attrdict.has_key('ns') or not attrdict.has_key('prefix'):
+            if not 'ns' in attrdict or not 'prefix' in attrdict:
                 self.syntax_error('xml:namespace without required attributes')
             prefix = attrdict.get('prefix')
             if ncname.match(prefix) is None:
                 self.syntax_error('xml:namespace illegal prefix value')
                 return end.end(0)
-            if self.__namespaces.has_key(prefix):
+            if prefix in self.__namespaces:
                 self.syntax_error('xml:namespace prefix not unique')
             self.__namespaces[prefix] = attrdict['ns']
         else:
@@ -581,7 +581,7 @@ class XMLParser:
                 continue
             if '<' in attrvalue:
                 self.syntax_error("`<' illegal in attribute value")
-            if attrdict.has_key(attrname):
+            if attrname in attrdict:
                 self.syntax_error("attribute `%s' specified twice" % attrname)
             attrvalue = attrvalue.translate(attrtrans)
             attrdict[attrname] = self.translate_references(attrvalue)
@@ -619,7 +619,7 @@ class XMLParser:
                 prefix = ''
             ns = None
             for t, d, nst in self.stack:
-                if d.has_key(prefix):
+                if prefix in d:
                     ns = d[prefix]
             if ns is None and prefix != '':
                 ns = self.__namespaces.get(prefix)
@@ -645,7 +645,7 @@ class XMLParser:
                         aprefix = ''
                     ans = None
                     for t, d, nst in self.stack:
-                        if d.has_key(aprefix):
+                        if aprefix in d:
                             ans = d[aprefix]
                     if ans is None and aprefix != '':
                         ans = self.__namespaces.get(aprefix)
@@ -661,10 +661,10 @@ class XMLParser:
         attributes = self.attributes.get(nstag)
         if attributes is not None:
             for key in attrdict.keys():
-                if not attributes.has_key(key):
+                if not key in attributes:
                     self.syntax_error("unknown attribute `%s' in tag `%s'" % (attrnamemap[key], tagname))
             for key, val in attributes.items():
-                if val is not None and not attrdict.has_key(key):
+                if val is not None and not key in attrdict:
                     attrdict[key] = val
         method = self.elements.get(nstag, (None, None))[0]
         self.finish_starttag(nstag, attrdict, method)
diff --git a/Lib/xmlrpclib.py b/Lib/xmlrpclib.py
index 8c6f799aa98..d1edf203973 100644
--- a/Lib/xmlrpclib.py
+++ b/Lib/xmlrpclib.py
@@ -496,7 +496,7 @@ class Marshaller:
     def opencontainer(self, value):
         if value:
             i = id(value)
-            if self.memo.has_key(i):
+            if i in self.memo:
                 raise TypeError, "cannot marshal recursive data structures"
             self.memo[i] = None
 
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 4e7ea105816..c0a0fe55662 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -354,7 +354,7 @@ class ZipFile:
 
     def _writecheck(self, zinfo):
         """Check for errors before writing a file to the archive."""
-        if self.NameToInfo.has_key(zinfo.filename):
+        if zinfo.filename in self.NameToInfo:
             if self.debug:      # Warning for duplicate names
                 print "Duplicate name:", zinfo.filename
         if self.mode not in ("w", "a"):