In a number of places code still revers
to "sys.platform == 'mac'" and that is
dead code because it refers to a platform
that is no longer supported (and hasn't been
supported for several releases).

Fixes issue #7908 for the trunk.
diff --git a/Misc/cheatsheet b/Misc/cheatsheet
index 98e3399..d878424 100644
--- a/Misc/cheatsheet
+++ b/Misc/cheatsheet
@@ -1390,7 +1390,7 @@
 
                                Some os variables
      Variable                                 Meaning
-name                name of O/S-specific module (e.g. "posix", "mac", "nt")
+name                name of O/S-specific module (e.g. "posix", "nt")
 path                O/S-specific module for path manipulations.
                     On Unix, os.path.split() <=> posixpath.split()
 curdir              string used to represent current directory ('.')