Python Login Script; Usernames and Passwords in a Separate File

Python Login Script; Usernames and Passwords in a separate file

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

Python Login Script; multiple passwords per account

import getpass

credentials = {}                                                            ## Sets up an array for the login credentials
with open('Usernames.txt', 'r') as f:                                       ## Opens the file and reads it
    for line in f:  ## For each line
        username, delim, password = line.strip().partition(':')                        ## Separate each line into username and password, splitting after a colon
        credentials[username] = password.split(';')                                    ## Links username to password

while True:
    username = raw_input("Please enter your username: ")                    ## Asks for username
    if username in credentials:                                           ## If the username is in the credentials array
        while True:
            password = getpass.getpass("Please enter your password: ")      ## Asks for password
            if password == credentials[username][0]:
                print "Logged in successfully as " + username               ## Log in
                break
            elif password in credentials[username]:                         ## If the password is linked to the username
                print "Specific error message " + username               ## Log in
            else:
                print "Password incorrect!"
        break
    else:
        print "Username incorrect!"

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It's simpler though if you just ask for a username/password fresh each time. The way you have it - if the user enters someone else's username by mistake they are stuck in a loop forever unless they can guess the password.

while True:
    username = raw_input("Please enter your username: ")                     
    password = getpass.getpass("Please enter your password: ")      
    if username in credentials and password == credentials[username][0]:
        print "Logged in successfully as " + username    
        break
    elif password in credentials.get(username, []):
        print "Specific error message " + username    
    else:
        print "Login incorrect!"

Saving passwords in a separate file

It's a common mistake in Python to confuse the dot in a import path as the dot in the folder system. In Python, the dot refers to the current package, while in the folder system it refers to the current folder. Basically a package in Python is defined as a folder with a __init__.py file.

So here when you enter from .details import username, what Python does is it tries to import username from the module details in the current package. If the current folder has a __init__.py file, no problem, but I don't think it's your case, hence the error.

What you want to write here is : from details import username, password, appKey.

You should see this SO post to understand more about relative imports.

Hope this helps!

python read/write to file login script

As said by sytech, you could use the break and else clauses of the for loop:

for row in file:
    field = row.split(",")
    username = field[0]
    password = field[1]
    lastchar = len(password)-1
    password = password[0:lastchar]

    if username1 == username and password1 == password:
        print("Hello",username)
        break
else:
    print("incorrect")

Storing the secrets (passwords) in a separate file

I think storing credentials inside another *py file is your safest bet. Then just import it. Example would look like this

config.py

username = "xy"
password = "abcd"

main.py

import config
login(config.username, config.password)

Simple login script multiple users from file

The logic was all wrong. You need something like that:

def check():
    # You need to read it only once, not every loop
    users = open("users.txt").read().split("\n")
    for i in range(len(users)): users[i] = users[i].split("|")

    # Now what you want is to loop infinitely
    # until you get correct username/password
    # instead of recursive calling this
    # function over and over again
    while True:
        username = str(input("Username: "))
        password = str(input("Password: "))

        for user in users:
            uname = user[4]
            pword = user[5]

            if uname == username and pword == password:
                print("Hello " + user[1] + ".")
                print("You are logged in as: " + user[2] + ".")
                main_menu()

        # If none of the records matched the input
        print("Wrong username/password.")
        print("Try again!\n\n")

check()

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