How do I determine if my python shell is executing in 32bit or 64bit?

Question

I need a way to tell what mode the shell is in from within the shell.

While I\'m primarily an OS X user, I\'d be interested in knowing about other platforms as well.<

Answer 1

Basically a variant on Matthew Marshall's answer (with struct from the std.library):

import struct
print struct.calcsize("P") * 8