diff --git a/Lib/asyncio/windows_events.py b/Lib/asyncio/windows_events.py
index 922594f..7be3e02 100644
--- a/Lib/asyncio/windows_events.py
+++ b/Lib/asyncio/windows_events.py
@@ -197,7 +197,7 @@
         #
         # If the IocpProactor already received the event, it's safe to call
         # _unregister() because we kept a reference to the Overlapped object
-        # which is used as an unique key.
+        # which is used as a unique key.
         self._proactor._unregister(self._ov)
         self._proactor = None
 
diff --git a/Lib/email/utils.py b/Lib/email/utils.py
index 5080d81..a759d23 100644
--- a/Lib/email/utils.py
+++ b/Lib/email/utils.py
@@ -87,7 +87,7 @@
     'utf-8'.
     """
     name, address = pair
-    # The address MUST (per RFC) be ascii, so raise an UnicodeError if it isn't.
+    # The address MUST (per RFC) be ascii, so raise a UnicodeError if it isn't.
     address.encode('ascii')
     if name:
         try:
diff --git a/Lib/heapq.py b/Lib/heapq.py
index 07af37e..0b3e89a 100644
--- a/Lib/heapq.py
+++ b/Lib/heapq.py
@@ -54,7 +54,7 @@
 
 
 In the tree above, each cell `k' is topping `2*k+1' and `2*k+2'.  In
-an usual binary tournament we see in sports, each cell is the winner
+a usual binary tournament we see in sports, each cell is the winner
 over the two cells it tops, and we can trace the winner down the tree
 to see all opponents s/he had.  However, in many computer applications
 of such tournaments, we do not need to trace the history of a winner.
diff --git a/Lib/nntplib.py b/Lib/nntplib.py
index a75faad..28cd099 100644
--- a/Lib/nntplib.py
+++ b/Lib/nntplib.py
@@ -165,7 +165,7 @@
 
 # Helper function(s)
 def decode_header(header_str):
-    """Takes an unicode string representing a munged header value
+    """Takes a unicode string representing a munged header value
     and decodes it as a (possibly non-ASCII) readable value."""
     parts = []
     for v, enc in _email_decode_header(header_str):
@@ -420,7 +420,7 @@
 
     def _putcmd(self, line):
         """Internal: send one command to the server (through _putline()).
-        The `line` must be an unicode string."""
+        The `line` must be a unicode string."""
         if self.debugging: print('*cmd*', repr(line))
         line = line.encode(self.encoding, self.errors)
         self._putline(line)
@@ -445,7 +445,7 @@
     def _getresp(self):
         """Internal: get a response from the server.
         Raise various errors if the response indicates an error.
-        Returns an unicode string."""
+        Returns a unicode string."""
         resp = self._getline()
         if self.debugging: print('*resp*', repr(resp))
         resp = resp.decode(self.encoding, self.errors)
@@ -462,7 +462,7 @@
         """Internal: get a response plus following text from the server.
         Raise various errors if the response indicates an error.
 
-        Returns a (response, lines) tuple where `response` is an unicode
+        Returns a (response, lines) tuple where `response` is a unicode
         string and `lines` is a list of bytes objects.
         If `file` is a file-like object, it must be open in binary mode.
         """
diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index 9cc5ca7..af6a709 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -177,7 +177,7 @@
     Return a 2-tuple (unc, rest); either part may be empty.
     If unc is not empty, it has the form '//host/mount' (or similar
     using backslashes).  unc+rest is always the input path.
-    Paths containing drive letters never have an UNC part.
+    Paths containing drive letters never have a UNC part.
     """
     import warnings
     warnings.warn("ntpath.splitunc is deprecated, use ntpath.splitdrive instead",
diff --git a/Lib/test/test_codecs.py b/Lib/test/test_codecs.py
index b93e0ab..c98afea 100644
--- a/Lib/test/test_codecs.py
+++ b/Lib/test/test_codecs.py
@@ -2355,7 +2355,7 @@
             self.assertRaises(TypeError, decoder, "xxx")
 
     def test_unicode_escape(self):
-        # Escape-decoding an unicode string is supported ang gives the same
+        # Escape-decoding a unicode string is supported ang gives the same
         # result as decoding the equivalent ASCII bytes string.
         self.assertEqual(codecs.unicode_escape_decode(r"\u1234"), ("\u1234", 6))
         self.assertEqual(codecs.unicode_escape_decode(br"\u1234"), ("\u1234", 6))
diff --git a/Lib/test/test_multibytecodec.py b/Lib/test/test_multibytecodec.py
index 2929f98..8d7a213 100644
--- a/Lib/test/test_multibytecodec.py
+++ b/Lib/test/test_multibytecodec.py
@@ -67,7 +67,7 @@
                           _multibytecodec.MultibyteStreamWriter, None)
 
     def test_decode_unicode(self):
-        # Trying to decode an unicode string should raise a TypeError
+        # Trying to decode a unicode string should raise a TypeError
         for enc in ALL_CJKENCODINGS:
             self.assertRaises(TypeError, codecs.getdecoder(enc), "")
 
@@ -160,7 +160,7 @@
         self.assertEqual(decoder.decode(b'B@$'), '\u4e16')
 
     def test_decode_unicode(self):
-        # Trying to decode an unicode string should raise a TypeError
+        # Trying to decode a unicode string should raise a TypeError
         for enc in ALL_CJKENCODINGS:
             decoder = codecs.getincrementaldecoder(enc)()
             self.assertRaises(TypeError, decoder.decode, "")
diff --git a/Lib/test/test_nntplib.py b/Lib/test/test_nntplib.py
index 3c69c3e..994532b 100644
--- a/Lib/test/test_nntplib.py
+++ b/Lib/test/test_nntplib.py
@@ -609,7 +609,7 @@
                     "\t\t6683\t16"
                     "\t"
                     "\n"
-                # An UTF-8 overview line from fr.comp.lang.python
+                # A UTF-8 overview line from fr.comp.lang.python
                 "59\tRe: Message d'erreur incompréhensible (par moi)"
                     "\tEric Brunel <eric.brunel@pragmadev.nospam.com>"
                     "\tWed, 15 Sep 2010 18:09:15 +0200"
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index ab263ab..a38e7b1 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -1774,7 +1774,7 @@
 
     def assertCorrectUTF8Decoding(self, seq, res, err):
         """
-        Check that an invalid UTF-8 sequence raises an UnicodeDecodeError when
+        Check that an invalid UTF-8 sequence raises a UnicodeDecodeError when
         'strict' is used, returns res when 'replace' is used, and that doesn't
         return anything when 'ignore' is used.
         """
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index ecdb5a7..1cafcb5 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -171,7 +171,7 @@
             self.assertEqual(zlib.decompress(ob), data)
 
     def test_incomplete_stream(self):
-        # An useful error message is given
+        # A useful error message is given
         x = zlib.compress(HAMLET_SCENE)
         self.assertRaisesRegex(zlib.error,
             "Error -5 while decompressing data: incomplete or truncated stream",