Random MD5 hash in python

I've been working generating MD5 hashes. I wrote a python module called RandomMD5:

    import hashlib
    import random

    def new():
        m = hashlib.md5()
        m.update(str(random.random()))
        return m.hexdigest()

This module generate a new md5 hash randomically, it's to useful for any kind of security sessions (like web session, chat session, etc.)

     import RandomMD5
     ...
     import ChatServer

     s = ChatServer.Session()
     
     md5_hash = RandomMD5.new()

     s.SessionKey = md5_hash