Added 'description' class attribute to every command class (to help the

'--help-commands' option).
Shuffled imports around in a few command modules to avoid expensive
  up-front import of sysconfig (and resulting delays in generating list
  of all commands).

Lib/distutils/command/dist.py

@@ -131,6 +131,8 @@ from distutils.errors import DistutilsExecError
 
 class Dist (Command):
 
+    description = "create a source distribution (tarball, zip file, etc.)"
+
     options = [('formats=', None,
                 "formats for source distribution (tar, ztar, gztar, or zip)"),
                ('manifest=', 'm',