Make docstrings raw, since they contain literal backslashes.

Lib/distutils/command/build_ext.py

@@ -545,7 +545,7 @@ class build_ext (Command):
             return self.package + '.' + ext_name
 
     def get_ext_filename (self, ext_name):
-        """Convert the name of an extension (eg. "foo.bar") into the name
+        r"""Convert the name of an extension (eg. "foo.bar") into the name
         of the file from which it will be loaded (eg. "foo/bar.so", or
         "foo\bar.pyd").
         """

Lib/pre.py

@@ -1,6 +1,6 @@
 # module 're' -- A collection of regular expression operations
 
-"""Support for regular expressions (RE).
+r"""Support for regular expressions (RE).
 
 This module provides regular expression matching operations similar to
 those found in Perl. It's 8-bit clean: the strings being processed may