How to permanently save a variable (login information)

I am trying to code a username and password system and was wondering if there was any way to save the variable so even when the code stops the username will work the next time. I have not yet started coding it and was just wondering if this was possible. I saw a few things on saving it as a file but with no luck. Thanks!

I tried saving it as a file but, I don't want to manually add every username and password.

Solution

You are look for persistence, there are different ways to do so, python-specific option is shelve which allows you to seamlessly store dict inside file, consider following simple phone-book example, let addphone.py content be

import shelve
name = input('What is your name?')
phone = input('What is your phone number?')
with shelve.open('phones') as db:
    db[name] = phone

and listphones.py content be

import shelve
with shelve.open('phones') as db:
    for name, phone in db.items():
        print(name,'uses phone',phone)

If your requirements stipulates interoperatibility with other software, you might consider using json or configparser, you might also consider other PersistenceTools