diff --git a/Doc/distutils/packageindex.rst b/Doc/distutils/packageindex.rst
index be72bb7..7494495 100644
--- a/Doc/distutils/packageindex.rst
+++ b/Doc/distutils/packageindex.rst
@@ -169,7 +169,7 @@
     username: <username>
     password: <password>
 
-The *distutils* section defines a *index-servers* variable that lists the
+The *distutils* section defines an *index-servers* variable that lists the
 name of all sections describing a repository.
 
 Each section describing a repository defines three variables:
diff --git a/Doc/howto/descriptor.rst b/Doc/howto/descriptor.rst
index 1a26281..e2359d9 100644
--- a/Doc/howto/descriptor.rst
+++ b/Doc/howto/descriptor.rst
@@ -325,7 +325,7 @@
 patterns of binding functions into methods.
 
 To recap, functions have a :meth:`__get__` method so that they can be converted
-to a method when accessed as attributes.  The non-data descriptor transforms a
+to a method when accessed as attributes.  The non-data descriptor transforms an
 ``obj.f(*args)`` call into ``f(obj, *args)``.  Calling ``klass.f(*args)``
 becomes ``f(*args)``.
 
diff --git a/Doc/install/index.rst b/Doc/install/index.rst
index 3b6ccba..eb499e9 100644
--- a/Doc/install/index.rst
+++ b/Doc/install/index.rst
@@ -149,7 +149,7 @@
 
 On Windows, you'd probably download :file:`foo-1.0.zip`.  If you downloaded the
 archive file to :file:`C:\\Temp`, then it would unpack into
-:file:`C:\\Temp\\foo-1.0`; you can use either a archive manipulator with a
+:file:`C:\\Temp\\foo-1.0`; you can use either an archive manipulator with a
 graphical user interface (such as WinZip) or a command-line tool (such as
 :program:`unzip` or :program:`pkunzip`) to unpack the archive.  Then, open a
 command prompt window and run::
diff --git a/Doc/library/email.parser.rst b/Doc/library/email.parser.rst
index 0f99a2f..04e2334 100644
--- a/Doc/library/email.parser.rst
+++ b/Doc/library/email.parser.rst
@@ -133,7 +133,7 @@
       methods on file-like objects.
 
       The text contained in *fp* must be formatted as a block of :rfc:`2822`
-      style headers and header continuation lines, optionally preceded by a
+      style headers and header continuation lines, optionally preceded by an
       envelope header.  The header block is terminated either by the end of the
       data or by a blank line.  Following the header block is the body of the
       message (which may contain MIME-encoded subparts).
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 5e3bd1c..ca91cd7 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -568,7 +568,7 @@
 .. versionadded:: 2.7
 
 Unittest supports skipping individual test methods and even whole classes of
-tests.  In addition, it supports marking a test as a "expected failure," a test
+tests.  In addition, it supports marking a test as an "expected failure," a test
 that is broken and will fail, but shouldn't be counted as a failure on a
 :class:`TestResult`.
 
diff --git a/Doc/library/zlib.rst b/Doc/library/zlib.rst
index 192bd4d..70e1483 100644
--- a/Doc/library/zlib.rst
+++ b/Doc/library/zlib.rst
@@ -31,7 +31,7 @@
 
 .. function:: adler32(data[, value])
 
-   Computes a Adler-32 checksum of *data*.  (An Adler-32 checksum is almost as
+   Computes an Adler-32 checksum of *data*.  (An Adler-32 checksum is almost as
    reliable as a CRC32 but can be computed much more quickly.)  If *value* is
    present, it is used as the starting value of the checksum; otherwise, a fixed
    default value is used.  This allows computing a running checksum over the
diff --git a/Doc/whatsnew/2.7.rst b/Doc/whatsnew/2.7.rst
index f4e7589..e2560c7 100644
--- a/Doc/whatsnew/2.7.rst
+++ b/Doc/whatsnew/2.7.rst
@@ -1118,7 +1118,7 @@
   (Fixed by Daniel Stutzbach; :issue:`8729`.)
 
 * Constructors for the parsing classes in the :mod:`ConfigParser` module now
-  take a *allow_no_value* parameter, defaulting to false; if true,
+  take an *allow_no_value* parameter, defaulting to false; if true,
   options without values will be allowed.  For example::
 
     >>> import ConfigParser, StringIO
diff --git a/Include/unicodeobject.h b/Include/unicodeobject.h
index 9ab724a..1269bf6 100644
--- a/Include/unicodeobject.h
+++ b/Include/unicodeobject.h
@@ -1307,7 +1307,7 @@
     int op                      /* Operation: Py_EQ, Py_NE, Py_GT, etc. */
     );
 
-/* Apply a argument tuple or dictionary to a format string and return
+/* Apply an argument tuple or dictionary to a format string and return
    the resulting Unicode string. */
 
 PyAPI_FUNC(PyObject *) PyUnicode_Format(
diff --git a/Lib/cookielib.py b/Lib/cookielib.py
index f2df467..eb9aec4 100644
--- a/Lib/cookielib.py
+++ b/Lib/cookielib.py
@@ -1434,7 +1434,7 @@
                         break
                     # convert RFC 2965 Max-Age to seconds since epoch
                     # XXX Strictly you're supposed to follow RFC 2616
-                    #   age-calculation rules.  Remember that zero Max-Age is a
+                    #   age-calculation rules.  Remember that zero Max-Age
                     #   is a request to discard (old and new) cookie, though.
                     k = "expires"
                     v = self._now + v
diff --git a/Lib/ctypes/test/test_random_things.py b/Lib/ctypes/test/test_random_things.py
index 0caffe3..d72b7c8 100644
--- a/Lib/ctypes/test/test_random_things.py
+++ b/Lib/ctypes/test/test_random_things.py
@@ -30,7 +30,7 @@
     # value is printed correctly.
     #
     # Changed in 0.9.3: No longer is '(in callback)' prepended to the
-    # error message - instead a additional frame for the C code is
+    # error message - instead an additional frame for the C code is
     # created, then a full traceback printed.  When SystemExit is
     # raised in a callback function, the interpreter exits.
 
diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index cb7edf0..b4f6b3c 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -1117,7 +1117,7 @@
 
         return self._bind(('bind', className), sequence, func, add, 0)
     def unbind_class(self, className, sequence):
-        """Unbind for a all widgets with bindtag CLASSNAME for event SEQUENCE
+        """Unbind for all widgets with bindtag CLASSNAME for event SEQUENCE
         all functions."""
         self.tk.call('bind', className , sequence, '')
     def mainloop(self, n=0):
diff --git a/Lib/lib2to3/fixes/fix_metaclass.py b/Lib/lib2to3/fixes/fix_metaclass.py
index 4f5593c..8399a13 100644
--- a/Lib/lib2to3/fixes/fix_metaclass.py
+++ b/Lib/lib2to3/fixes/fix_metaclass.py
@@ -114,7 +114,7 @@
                 left_node = expr_node.children[0]
                 if isinstance(left_node, Leaf) and \
                         left_node.value == u'__metaclass__':
-                    # We found a assignment to __metaclass__.
+                    # We found an assignment to __metaclass__.
                     fixup_simple_stmt(node, i, simple_node)
                     remove_trailing_newline(simple_node)
                     yield (node, i, simple_node)
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index a51387e..0007da6 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -62,7 +62,7 @@
 
 Additional Option Details:
 
--r randomizes test execution order. You can use --randseed=int to provide a
+-r randomizes test execution order. You can use --randseed=int to provide an
 int seed value for the randomizer; this is useful for reproducing troublesome
 test orders.
 
diff --git a/Lib/test/test_dict.py b/Lib/test/test_dict.py
index a5685b9..1c63fc0 100644
--- a/Lib/test/test_dict.py
+++ b/Lib/test/test_dict.py
@@ -448,7 +448,7 @@
         # (D) subclass defines __missing__ method returning a value
         # (E) subclass defines __missing__ method raising RuntimeError
         # (F) subclass sets __missing__ instance variable (no effect)
-        # (G) subclass doesn't define __missing__ at a all
+        # (G) subclass doesn't define __missing__ at all
         class D(dict):
             def __missing__(self, key):
                 return 42
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 252d5d8..34760c9 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -15,7 +15,7 @@
 ################################################################################
 # When writing tests for io, it's important to test both the C and Python
 # implementations. This is usually done by writing a base test that refers to
-# the type it is testing as a attribute. Then it provides custom subclasses to
+# the type it is testing as an attribute. Then it provides custom subclasses to
 # test both implementations. This file has lots of examples.
 ################################################################################
 
diff --git a/Lib/test/test_userdict.py b/Lib/test/test_userdict.py
index fa80fea..99526a2 100644
--- a/Lib/test/test_userdict.py
+++ b/Lib/test/test_userdict.py
@@ -188,7 +188,7 @@
         # (D) subclass defines __missing__ method returning a value
         # (E) subclass defines __missing__ method raising RuntimeError
         # (F) subclass sets __missing__ instance variable (no effect)
-        # (G) subclass doesn't define __missing__ at a all
+        # (G) subclass doesn't define __missing__ at all
         class D(UserDict.UserDict):
             def __missing__(self, key):
                 return 42
diff --git a/Misc/HISTORY b/Misc/HISTORY
index a29b907..41317e5 100644
--- a/Misc/HISTORY
+++ b/Misc/HISTORY
@@ -1495,7 +1495,7 @@
 
 - Bug #1194181: bz2.BZ2File didn't handle mode 'U' correctly.
 
-- Patch #1212117: os.stat().st_flags is now accessible as a attribute
+- Patch #1212117: os.stat().st_flags is now accessible as an attribute
   if available on the platform.
 
 - Patch #1103951: Expose O_SHLOCK and O_EXLOCK in the posix module if
diff --git a/Misc/NEWS b/Misc/NEWS
index b0b8962..c9dbb46 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -936,7 +936,7 @@
   Changes are written to HOME/.idlerc/config-extensions.cfg.
   Original patch by Tal Einat.
 
-- Issue #16233: A module browser (File : Class Browser, Alt+C) requires a
+- Issue #16233: A module browser (File : Class Browser, Alt+C) requires an
   editor window with a filename.  When Class Browser is requested otherwise,
   from a shell, output window, or 'Untitled' editor, Idle no longer displays
   an error box.  It now pops up an Open Module box (Alt+M). If a valid name
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index dff5925..17e1b85 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -2788,7 +2788,7 @@
             cadata_ascii = PyUnicode_AsASCIIString(cadata);
             if (cadata_ascii == NULL) {
                 PyErr_SetString(PyExc_TypeError,
-                                "cadata should be a ASCII string or a "
+                                "cadata should be an ASCII string or a "
                                 "bytes-like object");
                 goto error;
             }
diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index 394bbaf..c3cf1c0 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -1410,7 +1410,7 @@
 "starmap(function, sequence) --> starmap object\n\
 \n\
 Return an iterator whose values are returned from the function evaluated\n\
-with a argument tuple taken from the given sequence.");
+with an argument tuple taken from the given sequence.");
 
 static PyTypeObject starmap_type = {
     PyVarObject_HEAD_INIT(NULL, 0)