A Zope build question: where is sha.py

[Huayin Wang]

when compiling zope2.0 I got the following error message:
....
  File "../zope/Zope-2.0.0b1-src/zpasswd.py", line 90, in ?
    import sys, string, sha, binascii, whrandom, getopt, getpass, os
ImportError: No module named sha
....

I think it is a valid complain because I can't find sha.py anywhere on my system.
Please help.