diff --git a/Lib/cgitb.py b/Lib/cgitb.py
index db46b25d60b..735683e50cf 100644
--- a/Lib/cgitb.py
+++ b/Lib/cgitb.py
@@ -146,7 +146,7 @@ function calls leading up to the error, in the order they occurred.</p>'''
             if name in done: continue
             done[name] = 1
             if value is not __UNDEF__:
-                if where in ['global', 'builtin']:
+                if where in ('global', 'builtin'):
                     name = ('<em>%s</em> ' % where) + strong(name)
                 elif where == 'local':
                     name = strong(name)
diff --git a/Lib/cookielib.py b/Lib/cookielib.py
index 86479f864ad..268cc204fa3 100644
--- a/Lib/cookielib.py
+++ b/Lib/cookielib.py
@@ -783,12 +783,12 @@ class Cookie:
 
     def __repr__(self):
         args = []
-        for name in ["version", "name", "value",
+        for name in ("version", "name", "value",
                      "port", "port_specified",
                      "domain", "domain_specified", "domain_initial_dot",
                      "path", "path_specified",
                      "secure", "expires", "discard", "comment", "comment_url",
-                     ]:
+                     ):
             attr = getattr(self, name)
             args.append("%s=%s" % (name, repr(attr)))
         args.append("rest=%s" % repr(self._rest))
@@ -981,9 +981,9 @@ class DefaultCookiePolicy(CookiePolicy):
                 if j == 0:  # domain like .foo.bar
                     tld = domain[i+1:]
                     sld = domain[j+1:i]
-                    if (sld.lower() in [
+                    if (sld.lower() in (
                         "co", "ac",
-                        "com", "edu", "org", "net", "gov", "mil", "int"] and
+                        "com", "edu", "org", "net", "gov", "mil", "int") and
                         len(tld) == 2):
                         # domain like .co.uk
                         debug("   country-code second level domain %s", domain)
@@ -1415,7 +1415,7 @@ class CookieJar:
                     v = self._now + v
                 if (k in value_attrs) or (k in boolean_attrs):
                     if (v is None and
-                        k not in ["port", "comment", "commenturl"]):
+                        k not in ("port", "comment", "commenturl")):
                         debug("   missing value for %s attribute" % k)
                         bad_cookie = True
                         break
diff --git a/Lib/decimal.py b/Lib/decimal.py
index 05bdc99f4e0..90e2dccefaf 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -515,7 +515,7 @@ class Decimal(object):
         if isinstance(value, (list,tuple)):
             if len(value) != 3:
                 raise ValueError, 'Invalid arguments'
-            if value[0] not in [0,1]:
+            if value[0] not in (0,1):
                 raise ValueError, 'Invalid sign'
             for digit in value[1]:
                 if not isinstance(digit, (int,long)) or digit < 0:
diff --git a/Lib/inspect.py b/Lib/inspect.py
index 05bb71b81b9..03347b9a33f 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -346,7 +346,7 @@ def getmodulename(path):
 def getsourcefile(object):
     """Return the Python source file an object was defined in, if it exists."""
     filename = getfile(object)
-    if string.lower(filename[-4:]) in ['.pyc', '.pyo']:
+    if string.lower(filename[-4:]) in ('.pyc', '.pyo'):
         filename = filename[:-4] + '.py'
     for suffix, mode, kind in imp.get_suffixes():
         if 'b' in mode and string.lower(filename[-len(suffix):]) == suffix:
@@ -453,7 +453,7 @@ def getcomments(object):
         # Look for a comment block at the top of the file.
         start = 0
         if lines and lines[0][:2] == '#!': start = 1
-        while start < len(lines) and string.strip(lines[start]) in ['', '#']:
+        while start < len(lines) and string.strip(lines[start]) in ('', '#'):
             start = start + 1
         if start < len(lines) and lines[start][:1] == '#':
             comments = []
@@ -621,7 +621,7 @@ def getargs(co):
 
     # The following acrobatics are for anonymous (tuple) arguments.
     for i in range(nargs):
-        if args[i][:1] in ['', '.']:
+        if args[i][:1] in ('', '.'):
             stack, remain, count = [], [], []
             while step < len(code):
                 op = ord(code[step])
@@ -630,7 +630,7 @@ def getargs(co):
                     opname = dis.opname[op]
                     value = ord(code[step]) + ord(code[step+1])*256
                     step = step + 2
-                    if opname in ['UNPACK_TUPLE', 'UNPACK_SEQUENCE']:
+                    if opname in ('UNPACK_TUPLE', 'UNPACK_SEQUENCE'):
                         remain.append(value)
                         count.append(value)
                     elif opname == 'STORE_FAST':
@@ -696,7 +696,7 @@ def joinseq(seq):
 
 def strseq(object, convert, join=joinseq):
     """Recursively walk a sequence, stringifying each element."""
-    if type(object) in [types.ListType, types.TupleType]:
+    if type(object) in (list, tuple):
         return join(map(lambda o, c=convert, j=join: strseq(o, c, j), object))
     else:
         return convert(object)
diff --git a/Lib/mhlib.py b/Lib/mhlib.py
index 1086121584f..1a903752103 100644
--- a/Lib/mhlib.py
+++ b/Lib/mhlib.py
@@ -982,11 +982,11 @@ def test():
     context = mh.getcontext()
     f = mh.openfolder(context)
     do('f.getcurrent()')
-    for seq in ['first', 'last', 'cur', '.', 'prev', 'next',
+    for seq in ('first', 'last', 'cur', '.', 'prev', 'next',
                 'first:3', 'last:3', 'cur:3', 'cur:-3',
                 'prev:3', 'next:3',
                 '1:3', '1:-3', '100:3', '100:-3', '10000:3', '10000:-3',
-                'all']:
+                'all'):
         try:
             do('f.parsesequence(%r)' % (seq,))
         except Error, msg:
diff --git a/Lib/posixfile.py b/Lib/posixfile.py
index ddfdb780c15..afffb66e490 100644
--- a/Lib/posixfile.py
+++ b/Lib/posixfile.py
@@ -182,7 +182,7 @@ class _posixfile_:
                             'freebsd6', 'bsdos2', 'bsdos3', 'bsdos4'):
             flock = struct.pack('lxxxxlxxxxlhh', \
                   l_start, l_len, os.getpid(), l_type, l_whence)
-        elif sys.platform in ['aix3', 'aix4']:
+        elif sys.platform in ('aix3', 'aix4'):
             flock = struct.pack('hhlllii', \
                   l_type, l_whence, l_start, l_len, 0, 0, 0)
         else:
@@ -198,7 +198,7 @@ class _posixfile_:
                                 'bsdos2', 'bsdos3', 'bsdos4'):
                 l_start, l_len, l_pid, l_type, l_whence = \
                     struct.unpack('lxxxxlxxxxlhh', flock)
-            elif sys.platform in ['aix3', 'aix4']:
+            elif sys.platform in ('aix3', 'aix4'):
                 l_type, l_whence, l_start, l_len, l_sysid, l_pid, l_vfs = \
                     struct.unpack('hhlllii', flock)
             elif sys.platform == "linux2":
diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index d3b7362dd4d..94548e29693 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -153,8 +153,8 @@ def _split_list(s, predicate):
 def visiblename(name, all=None):
     """Decide whether to show documentation on a variable."""
     # Certain special names are redundant.
-    if name in ['__builtins__', '__doc__', '__file__', '__path__',
-                '__module__', '__name__', '__slots__']: return 0
+    if name in ('__builtins__', '__doc__', '__file__', '__path__',
+                '__module__', '__name__', '__slots__'): return 0
     # Private names are hidden, but special names are displayed.
     if name.startswith('__') and name.endswith('__'): return 1
     if all is not None:
@@ -176,7 +176,7 @@ def classify_class_attrs(object):
 def ispackage(path):
     """Guess whether a path refers to a package directory."""
     if os.path.isdir(path):
-        for ext in ['.py', '.pyc', '.pyo']:
+        for ext in ('.py', '.pyc', '.pyo'):
             if os.path.isfile(os.path.join(path, '__init__' + ext)):
                 return True
     return False
@@ -1298,12 +1298,12 @@ def getpager():
         return plainpager
     if not sys.stdin.isatty() or not sys.stdout.isatty():
         return plainpager
-    if os.environ.get('TERM') in ['dumb', 'emacs']:
+    if os.environ.get('TERM') in ('dumb', 'emacs'):
         return plainpager
     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']:
+        elif os.environ.get('TERM') in ('dumb', 'emacs'):
             return lambda text: pipepager(plain(text), os.environ['PAGER'])
         else:
             return lambda text: pipepager(text, os.environ['PAGER'])
@@ -1369,14 +1369,14 @@ def ttypager(text):
             sys.stdout.flush()
             c = getchar()
 
-            if c in ['q', 'Q']:
+            if c in ('q', 'Q'):
                 sys.stdout.write('\r          \r')
                 break
-            elif c in ['\r', '\n']:
+            elif c in ('\r', '\n'):
                 sys.stdout.write('\r          \r' + lines[r] + '\n')
                 r = r + 1
                 continue
-            if c in ['b', 'B', '\x1b']:
+            if c in ('b', 'B', '\x1b'):
                 r = r - inc - inc
                 if r < 0: r = 0
             sys.stdout.write('\n' + join(lines[r:r+inc], '\n') + '\n')
@@ -1646,7 +1646,7 @@ has the same effect as typing a particular string at the help> prompt.
             except (KeyboardInterrupt, EOFError):
                 break
             request = strip(replace(request, '"', '', "'", ''))
-            if lower(request) in ['q', 'quit']: break
+            if lower(request) in ('q', 'quit'): break
             self.help(request)
 
     def getline(self, prompt):
diff --git a/Lib/smtplib.py b/Lib/smtplib.py
index 52a2e1f8668..5b406af3887 100755
--- a/Lib/smtplib.py
+++ b/Lib/smtplib.py
@@ -578,7 +578,7 @@ class SMTP:
             (code, resp) = self.docmd(encode_base64(password, eol=""))
         elif authmethod is None:
             raise SMTPException("No suitable authentication method found.")
-        if code not in [235, 503]:
+        if code not in (235, 503):
             # 235 == 'Authentication successful'
             # 503 == 'Error: already authenticated'
             raise SMTPAuthenticationError(code, resp)
diff --git a/Lib/urllib2.py b/Lib/urllib2.py
index ae2ab17dab1..3d8d593c908 100644
--- a/Lib/urllib2.py
+++ b/Lib/urllib2.py
@@ -384,7 +384,7 @@ class OpenerDirector:
                                 'unknown_open', req)
 
     def error(self, proto, *args):
-        if proto in ['http', 'https']:
+        if proto in ('http', 'https'):
             # XXX http[s] protocols are special-cased
             dict = self.handle_error['http'] # https is not different than http
             proto = args[2]  # YUCK!
diff --git a/Lib/warnings.py b/Lib/warnings.py
index 06d7685ece1..87d3e2947ab 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -216,7 +216,7 @@ def _getaction(action):
     if not action:
         return "default"
     if action == "all": return "always" # Alias
-    for a in ['default', 'always', 'ignore', 'module', 'once', 'error']:
+    for a in ('default', 'always', 'ignore', 'module', 'once', 'error'):
         if a.startswith(action):
             return a
     raise _OptionError("invalid action: %r" % (action,))
diff --git a/Lib/whichdb.py b/Lib/whichdb.py
index cc5ced3acd1..f077f875310 100644
--- a/Lib/whichdb.py
+++ b/Lib/whichdb.py
@@ -62,7 +62,7 @@ def whichdb(filename):
             return "dumbdbm"
         f = open(filename + os.extsep + "dir", "rb")
         try:
-            if f.read(1) in ["'", '"']:
+            if f.read(1) in ("'", '"'):
                 return "dumbdbm"
         finally:
             f.close()