Login Credentials | Python Fiddle

import haslib, os
resource_file = "password.txt"
def encode(username,password):
    return "$%s::%s$"%(username,hashlib.sha1(password).hexdigest())
def add_user(username,password):
    if os.path.exists(resource_file):
        with open(resource_file) as f:
            if "$%s::"%username in f.read():
                raise Exception("User already exists")
    with open(resource_file,"w") as f:
        print >> f, encode(username,password)
    return username

def create_username():
    try:
        username = add_user(raw_input("enter username:"),raw_input("enter password: "))
        print "Added User! %s"%username
    except Exception as e:
        print "Failed to add user%s! ... user already exist??"%username
        
def login():
    if check_login(raw_input("enter username:"),raw_input("enter password:")):
        print "Login Success!!"
    else:
        print "there was a problem logging in"

while True:
    {'c':create_username,'l':login}.get(raw_input("(c)reate user\n(l)ogin\n ------------\n>").lower(),login)()
    
username = raw_input("Username:")
password = raw_input("Password:")
if password == "CHANGE" and username == "CHANGE":
    print "Logged in as "CHANGE"

else:
    print "Incorrect Password. Please try again."

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