_make_boundary(): A minor optimization suggested by the Timbot.

Lib/email/Generator.py

@@ -363,7 +363,7 @@ _fmt = '%%0%dd' % _width
 def _make_boundary(text=None):
     # Craft a random boundary.  If text is given, ensure that the chosen
     # boundary doesn't appear in the text.
-    token = random.randint(0, sys.maxint-1)
+    token = random.randrange(sys.maxint)
     boundary = ('=' * 15) + (_fmt % token) + '=='
     if text is None:
         return boundary