python nested dictionaries to store usernames and passwords - python-2.7

Question

What I'm trying to create is a dictionary that stores hashed usernames and passwords from user input... Now admittedly I don't think I fully understand how nested dictionaries work but here is the code of my function so far:
users = {}
def addUser():
print """"
########
Add user
########
"""
while True:
username = hashlib.sha512(raw_input("Enter username: ")).hexdigest()
passwd = hashlib.sha512(raw_input("Enter password: ")).hexdigest()
uid = int(username[:5], 16) % 32
users[username + passwd] = {
'User hash':username,
'Password hash':passwd,
}
print users
cont = raw_input("Press 'X/x' to exit and start the server or ANY other key to continue adding users: ")
if cont in ['X', 'x']:
break
What I want to do is use the uid variable to generate a unique identifier for each user and store it in a nested dictionary that will look something like this:
users = { 'uid': 28 { 'User hash': 'BFCDF3E6CA6CEF45543BFBB57509C92AEC9A39FB', 'Password hash': '9D989E8D27DC9E0EC3389FC855F142C3D40F0C50'},'uid': 10 { 'User hash': '8C4947E96C7C9F770AA386582E32CE7CE1B96E69', 'Password hash': '266F83D202FA3DA4A075CEA751B4B8D6A30DA1A8'}
}

Answer 1

Answered my own question after doing some reading and playing around with the code.
Here's the solved code if anyone else is having a similar issue
import hashlib
users = {}
def addUser()
print """"
########
Add user
########
"""
while True:
username = hashlib.sha512(raw_input("Enter username: ")).hexdigest() #use SHA512 to hash username from raw input
uid = int(username[:5], 16) % 32 #generate uid from hashed username, using math simliar to the chord algorithm but with SHA512 instead of SHA1
passwd = hashlib.sha512(raw_input("Enter password: ")).hexdigest() #use SHA512 to hash password from raw input
users[uid] = { #store username and password in dictionary
'User hash':username,
'Password hash':passwd,
}
print users
cont = raw_input("Press 'X/x' to exit and start the server or ANY other key to continue adding users: ")
if cont in ['X', 'x']:
break
I figured it out by looking at what the print users call actually did and it printed a combination of the two hashes, so replacing users[username + passwd] with users[uid] solved the issue!
Moral of the story: If it doesn't work... Do some research, have a play around & Try harder! ;)