diff --git a/Lib/bsddb/test/test_basics.py b/Lib/bsddb/test/test_basics.py
index 52de869..0be76db 100644
--- a/Lib/bsddb/test/test_basics.py
+++ b/Lib/bsddb/test/test_basics.py
@@ -131,7 +131,7 @@
 
         self.assertEqual(d.get('0321'), '0321-0321-0321-0321-0321')
 
-        # By default non-existant keys return None...
+        # By default non-existent keys return None...
         self.assertEqual(d.get('abcd'), None)
 
         # ...but they raise exceptions in other situations.  Call
diff --git a/Lib/bsddb/test/test_compat.py b/Lib/bsddb/test/test_compat.py
index a3b4eef..0b0fa70 100644
--- a/Lib/bsddb/test/test_compat.py
+++ b/Lib/bsddb/test/test_compat.py
@@ -133,7 +133,7 @@
             except KeyError:
                 pass
             else:
-                self.fail("set_location on non-existant key did not raise KeyError")
+                self.fail("set_location on non-existent key did not raise KeyError")
 
         f.sync()
         f.close()
diff --git a/Lib/bsddb/test/test_recno.py b/Lib/bsddb/test/test_recno.py
index b5df68b..895be8a 100644
--- a/Lib/bsddb/test/test_recno.py
+++ b/Lib/bsddb/test/test_recno.py
@@ -150,7 +150,7 @@
         if verbose:
             print rec
 
-        # test that non-existant key lookups work (and that
+        # test that non-existent key lookups work (and that
         # DBC_set_range doesn't have a memleak under valgrind)
         rec = c.set_range(999999)
         self.assertEqual(rec, None)
diff --git a/Lib/difflib.py b/Lib/difflib.py
index 7498e6f..679bd2a 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -1329,7 +1329,7 @@
     (from line tuple, to line tuple, boolean flag)
 
     from/to line tuple -- (line num, line text)
-        line num -- integer or None (to indicate a context seperation)
+        line num -- integer or None (to indicate a context separation)
         line text -- original line text with following markers inserted:
             '\0+' -- marks start of added text
             '\0-' -- marks start of deleted text
diff --git a/Lib/distutils/tests/test_core.py b/Lib/distutils/tests/test_core.py
index 55d2d5d..e481e8d 100644
--- a/Lib/distutils/tests/test_core.py
+++ b/Lib/distutils/tests/test_core.py
@@ -57,7 +57,7 @@
 
     def test_run_setup_uses_current_dir(self):
         # This tests that the setup script is run with the current directory
-        # as it's own current directory; this was temporarily broken by a
+        # as its own current directory; this was temporarily broken by a
         # previous patch when TESTFN did not use the current directory.
         sys.stdout = StringIO.StringIO()
         cwd = os.getcwd()
diff --git a/Lib/email/message.py b/Lib/email/message.py
index e44217b..23cedf6 100644
--- a/Lib/email/message.py
+++ b/Lib/email/message.py
@@ -20,7 +20,7 @@
 SEMISPACE = '; '
 
 # Regular expression that matches `special' characters in parameters, the
-# existance of which force quoting of the parameter value.
+# existence of which force quoting of the parameter value.
 tspecials = re.compile(r'[ \(\)<>@,;:\\"/\[\]\?=]')
 
 
diff --git a/Lib/idlelib/AutoComplete.py b/Lib/idlelib/AutoComplete.py
index 1c74d2e..d55b799 100644
--- a/Lib/idlelib/AutoComplete.py
+++ b/Lib/idlelib/AutoComplete.py
@@ -67,7 +67,7 @@
 
     def try_open_completions_event(self, event):
         """Happens when it would be nice to open a completion list, but not
-        really neccesary, for example after an dot, so function
+        really necessary, for example after an dot, so function
         calls won't be made.
         """
         lastchar = self.text.get("insert-1c")
@@ -79,7 +79,7 @@
                                          COMPLETE_FILES)
 
     def autocomplete_event(self, event):
-        """Happens when the user wants to complete his word, and if neccesary,
+        """Happens when the user wants to complete his word, and if necessary,
         open a completion list after that (if there is more than one
         completion)
         """
diff --git a/Lib/idlelib/CallTips.py b/Lib/idlelib/CallTips.py
index 7bcc1e2..bd51b7f 100644
--- a/Lib/idlelib/CallTips.py
+++ b/Lib/idlelib/CallTips.py
@@ -51,7 +51,7 @@
 
     def try_open_calltip_event(self, event):
         """Happens when it would be nice to open a CallTip, but not really
-        neccesary, for example after an opening bracket, so function calls
+        necessary, for example after an opening bracket, so function calls
         won't be made.
         """
         self.open_calltip(False)
diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index 297dd31..96a138b 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -310,7 +310,7 @@
   window raising, especially in the Windows menu and in the debugger.
   IDLEfork 763524.
 
-- If user passes a non-existant filename on the commandline, just
+- If user passes a non-existent filename on the commandline, just
   open a new file, don't raise a dialog.  IDLEfork 854928.
 
 
diff --git a/Lib/io.py b/Lib/io.py
index 72f7d8c..03c8676 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -4,7 +4,7 @@
 
 At the top of the I/O hierarchy is the abstract base class IOBase. It
 defines the basic interface to a stream. Note, however, that there is no
-seperation between reading and writing to streams; implementations are
+separation between reading and writing to streams; implementations are
 allowed to throw an IOError if they do not support a given operation.
 
 Extending IOBase is RawIOBase which deals simply with the reading and
@@ -1374,7 +1374,7 @@
     enabled.  With this enabled, on input, the lines endings '\n', '\r',
     or '\r\n' are translated to '\n' before being returned to the
     caller. Conversely, on output, '\n' is translated to the system
-    default line seperator, os.linesep. If newline is any other of its
+    default line separator, os.linesep. If newline is any other of its
     legal values, that newline becomes the newline when the file is read
     and it is returned untranslated. On output, '\n' is converted to the
     newline.
diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index 825e58d..3cce276 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -3316,7 +3316,7 @@
         """Return the color (red, green, blue) of the pixel at X,Y."""
         return self.tk.call(self.name, 'get', x, y)
     def put(self, data, to=None):
-        """Put row formated colors to image starting from
+        """Put row formatted colors to image starting from
         position TO, e.g. image.put("{red green} {blue yellow}", to=(4,6))"""
         args = (self.name, 'put', data)
         if to:
diff --git a/Lib/lib-tk/turtle.py b/Lib/lib-tk/turtle.py
index 7bce6f6..a3dc852 100644
--- a/Lib/lib-tk/turtle.py
+++ b/Lib/lib-tk/turtle.py
@@ -2794,7 +2794,7 @@
 
     def _drawturtle(self):
         """Manages the correct rendering of the turtle with respect to
-        its shape, resizemode, strech and tilt etc."""
+        its shape, resizemode, stretch and tilt etc."""
         screen = self.screen
         shape = screen._shapes[self.turtle.shapeIndex]
         ttype = shape._type
diff --git a/Lib/optparse.py b/Lib/optparse.py
index 53bdef0..d0d5961 100644
--- a/Lib/optparse.py
+++ b/Lib/optparse.py
@@ -1588,7 +1588,7 @@
         """print_usage(file : file = stdout)
 
         Print the usage message for the current program (self.usage) to
-        'file' (default stdout).  Any occurence of the string "%prog" in
+        'file' (default stdout).  Any occurrence of the string "%prog" in
         self.usage is replaced with the name of the current program
         (basename of sys.argv[0]).  Does nothing if self.usage is empty
         or not defined.
@@ -1606,7 +1606,7 @@
         """print_version(file : file = stdout)
 
         Print the version message for this program (self.version) to
-        'file' (default stdout).  As with print_usage(), any occurence
+        'file' (default stdout).  As with print_usage(), any occurrence
         of "%prog" in self.version is replaced by the current program's
         name.  Does nothing if self.version is empty or undefined.
         """
diff --git a/Lib/plat-mac/bundlebuilder.py b/Lib/plat-mac/bundlebuilder.py
index f0c7fc2..dda9510 100755
--- a/Lib/plat-mac/bundlebuilder.py
+++ b/Lib/plat-mac/bundlebuilder.py
@@ -661,7 +661,7 @@
                 if USE_ZIPIMPORT:
                     if name != "zlib":
                         # neatly pack all extension modules in a subdirectory,
-                        # except zlib, since it's neccesary for bootstrapping.
+                        # except zlib, since it's necessary for bootstrapping.
                         dstpath = pathjoin("ExtensionModules", dstpath)
                     # Python modules are stored in a Zip archive, but put
                     # extensions in Contents/Resources/. Add a tiny "loader"
diff --git a/Lib/smtpd.py b/Lib/smtpd.py
index e09774f..3992d7b 100755
--- a/Lib/smtpd.py
+++ b/Lib/smtpd.py
@@ -420,7 +420,7 @@
         s = StringIO(data)
         msg = Message.Message(s)
         # These headers are required for the proper execution of Mailman.  All
-        # MTAs in existance seem to add these if the original message doesn't
+        # MTAs in existence seem to add these if the original message doesn't
         # have them.
         if not msg.getheader('from'):
             msg['From'] = mailfrom
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index 2c22839..687ef81 100644
--- a/Lib/tarfile.py
+++ b/Lib/tarfile.py
@@ -1775,7 +1775,7 @@
     def getmember(self, name):
         """Return a TarInfo object for member `name'. If `name' can not be
            found in the archive, KeyError is raised. If a member occurs more
-           than once in the archive, its last occurence is assumed to be the
+           than once in the archive, its last occurrence is assumed to be the
            most up-to-date version.
         """
         tarinfo = self._getmember(name)
diff --git a/Lib/test/test_calendar.py b/Lib/test/test_calendar.py
index 75eaebd..fad517c 100644
--- a/Lib/test/test_calendar.py
+++ b/Lib/test/test_calendar.py
@@ -170,7 +170,7 @@
 
 class OutputTestCase(unittest.TestCase):
     def normalize_calendar(self, s):
-        # Filters out locale dependant strings
+        # Filters out locale dependent strings
         def neitherspacenordigit(c):
             return not c.isspace() and not c.isdigit()
 
diff --git a/Lib/test/test_cfgparser.py b/Lib/test/test_cfgparser.py
index 173f40f..a0d8051 100644
--- a/Lib/test/test_cfgparser.py
+++ b/Lib/test/test_cfgparser.py
@@ -87,11 +87,11 @@
         # Make sure the right things happen for remove_option();
         # added to include check for SourceForge bug #123324:
         self.failUnless(cf.remove_option('Foo Bar', 'foo'),
-                        "remove_option() failed to report existance of option")
+                        "remove_option() failed to report existence of option")
         self.failIf(cf.has_option('Foo Bar', 'foo'),
                     "remove_option() failed to remove option")
         self.failIf(cf.remove_option('Foo Bar', 'foo'),
-                    "remove_option() failed to report non-existance of option"
+                    "remove_option() failed to report non-existence of option"
                     " that was removed")
 
         self.assertRaises(ConfigParser.NoSectionError,
@@ -264,7 +264,7 @@
         file1 = test_support.findfile("cfgparser.1")
         # check when we pass a mix of readable and non-readable files:
         cf = self.newconfig()
-        parsed_files = cf.read([file1, "nonexistant-file"])
+        parsed_files = cf.read([file1, "nonexistent-file"])
         self.assertEqual(parsed_files, [file1])
         self.assertEqual(cf.get("Foo Bar", "foo"), "newbar")
         # check when we pass only a filename:
@@ -274,7 +274,7 @@
         self.assertEqual(cf.get("Foo Bar", "foo"), "newbar")
         # check when we pass only missing files:
         cf = self.newconfig()
-        parsed_files = cf.read(["nonexistant-file"])
+        parsed_files = cf.read(["nonexistent-file"])
         self.assertEqual(parsed_files, [])
         # check when we pass no files:
         cf = self.newconfig()
diff --git a/Lib/test/test_codeccallbacks.py b/Lib/test/test_codeccallbacks.py
index 656551d..a37a326 100644
--- a/Lib/test/test_codeccallbacks.py
+++ b/Lib/test/test_codeccallbacks.py
@@ -109,7 +109,7 @@
         # useful that the error handler is not called for every single
         # unencodable character, but for a complete sequence of
         # unencodable characters, otherwise we would output many
-        # unneccessary escape sequences.
+        # unnecessary escape sequences.
 
         def uninamereplace(exc):
             if not isinstance(exc, UnicodeEncodeError):
diff --git a/Lib/test/test_cookielib.py b/Lib/test/test_cookielib.py
index 66f9a83..93d62f7 100644
--- a/Lib/test/test_cookielib.py
+++ b/Lib/test/test_cookielib.py
@@ -1714,7 +1714,7 @@
             counter[key] = counter[key] + 1
 
         self.assert_(not (
-            # a permanent cookie got lost accidently
+            # a permanent cookie got lost accidentally
             counter["perm_after"] != counter["perm_before"] or
             # a session cookie hasn't been cleared
             counter["session_after"] != 0 or
diff --git a/Lib/test/test_descrtut.py b/Lib/test/test_descrtut.py
index 8088819..c455e6b 100644
--- a/Lib/test/test_descrtut.py
+++ b/Lib/test/test_descrtut.py
@@ -54,7 +54,7 @@
     {1: 3.25}
     >>> print a[1]                      # show the new item
     3.25
-    >>> print a[0]                      # a non-existant item
+    >>> print a[0]                      # a non-existent item
     0.0
     >>> a.merge({1:100, 2:200})         # use a dict method
     >>> print sortdict(a)               # show the result
diff --git a/Lib/test/test_funcattrs.py b/Lib/test/test_funcattrs.py
index e245d59..f374c8d 100644
--- a/Lib/test/test_funcattrs.py
+++ b/Lib/test/test_funcattrs.py
@@ -196,7 +196,7 @@
 
     def test_unset_attr(self):
         for func in [self.b, self.f.a, self.fi.a]:
-            try:  func.non_existant_attr
+            try:  func.non_existent_attr
             except AttributeError: pass
             else: self.fail("using unknown attributes should raise "
                             "AttributeError")
diff --git a/Lib/test/test_urllib2net.py b/Lib/test/test_urllib2net.py
index 3d01b31..b4e6ae5 100644
--- a/Lib/test/test_urllib2net.py
+++ b/Lib/test/test_urllib2net.py
@@ -104,7 +104,7 @@
     def test_ftp(self):
         urls = [
             'ftp://ftp.kernel.org/pub/linux/kernel/README',
-            'ftp://ftp.kernel.org/pub/linux/kernel/non-existant-file',
+            'ftp://ftp.kernel.org/pub/linux/kernel/non-existent-file',
             #'ftp://ftp.kernel.org/pub/leenox/kernel/test',
             'ftp://gatekeeper.research.compaq.com/pub/DEC/SRC'
                 '/research-reports/00README-Legal-Rules-Regs',
diff --git a/Lib/wsgiref/headers.py b/Lib/wsgiref/headers.py
index 3169acf..02fd6a0 100644
--- a/Lib/wsgiref/headers.py
+++ b/Lib/wsgiref/headers.py
@@ -8,7 +8,7 @@
 from types import ListType, TupleType
 
 # Regular expression that matches `special' characters in parameters, the
-# existance of which force quoting of the parameter value.
+# existence of which force quoting of the parameter value.
 import re
 tspecials = re.compile(r'[ \(\)<>@,;:\\"/\[\]\?=]')