diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index 813b67c..cbcf107 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -226,7 +226,7 @@
         while bytes > 0:
             sent = self.sock.send(data)
             if sent == bytes:
-                break	# avoid copy
+                break   # avoid copy
             data = data[sent:]
             bytes = bytes - sent
 
diff --git a/Lib/os.py b/Lib/os.py
index e13c2f9..bf31ddc 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -362,7 +362,7 @@
     import UserDict
 
     # Fake unsetenv() for Windows
-    # not sure about os2 and dos here but 
+    # not sure about os2 and dos here but
     # I'm guessing they are the same.
 
     if name in ('os2', 'nt', 'dos'):
@@ -421,7 +421,7 @@
                 def __delitem__(self, key):
                     unsetenv(key)
                     del self.data[key]
-                
+
 
     environ = _Environ(environ)
 
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index b2bb7ac..329800c 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -38,7 +38,7 @@
 
     curses -    Tests that use curses and will modify the terminal's
                 state and output modes.
-                
+
     largefile - It is okay to run some test that may create huge files.  These
                 tests can take a long time and may consume >2GB of disk space
                 temporarily.
diff --git a/Lib/test/test_mimetypes.py b/Lib/test/test_mimetypes.py
index bca5766..d0a32a9 100644
--- a/Lib/test/test_mimetypes.py
+++ b/Lib/test/test_mimetypes.py
@@ -39,7 +39,7 @@
                          ".pyunit")
 
     def test_non_standard_types(self):
-        # First try strict 
+        # First try strict
         self.assertEqual(self.db.guess_type('foo.xul', strict=1),
                          (None, None))
         self.assertEqual(self.db.guess_extension('image/jpg', strict=1),