Python Login Script; Usernames And Passwords In A Separate File

I'm looking for assistance to get my Python script to imitate a log-in feature while the credentials are stored in a separate file. I got it to work from hard-coded Username and Pa

Solution 1:

You could start having a dictionary of usernames and passwords:

credentials = {}
with open('Usernames.txt', 'r') as f:
    for line in f:
        user, pwd = line.strip().split(':')
        credentials[user] = pwd

Then you have two easy tests:

username in credentials

will tell you if the username is in the credentials file (ie. if it's a key in the credentials dictionary)

And then:

credentials[username] == password

Solution 2:

import hashlib ,os
resource_file = "passwords.txt"defencode(username,password):
    return"$%s::%s$"%(username,hashlib.sha1(password).hexdigest())
defadd_user(username,password):
    if os.path.exists(resource_file):
        withopen(resource_file) as f:
            if"$%s::"%username in f.read():
                raise Exception("user already exists")
    withopen(resource_file,"w") as f:
         print >> f, encode(username,password)
    return username
defcheck_login(username,password):
    withopen(resource_file) as f:
        if encode(username,password) in f.read():
           return username

defcreate_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 exists??"%username
deflogin():
     if check_login(raw_input("enter username:"),raw_input("enter password:")):
        print"Login Success!!"else:
        print"there was a problem logging in"whileTrue:
    {'c':create_username,'l':login}.get(raw_input("(c)reate user\n(l)ogin\n------------\n>").lower(),login)()

Solution 3:

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."