How do I check if two input variables are in the same position in two different lists and return as-CodePudding

I'm trying to create a simple login sequence in terminal but I can't figure out how to check if both the username and the password are in the same position in the list

usernames = ['username', 'hello']
passwords = ['password', 'world']

# my code so far:
from getpass import getpass
import time
import logins

username = input('Username: ')
password = input('Password: ')

print('Logging In...')
time.sleep(1)

def check_login(user, pasw):
    if user in logins.users and pasw in logins.passes:
        print('Valid')
    else:
        print('Invalid user and password, try again.')


check_login(username, password)

#It works except for the fact that i can input (username, world) or (hello, password) #I'm trying to check that each username and password are in the same order (0,0, 1,1, etc) and #return it as valid. Any help is appreciated :)

CodePudding user response：

You can use zip:

def check_login(user, pasw):
    if (user, pasw) in zip(logins.users, logins.passes):
        print('Valid')
    else:
        print('Invalid user and password, try again.')

If you are to call this method repeatedly, it is better to create a O(1) lookup structure:

lookup = dict(zip(logins.users, logins.passes))

def check_login(user, pasw):
    if lookup.get(user, None) == pasw:
        print('Valid')
    else:
        print('Invalid user and password, try again.')

CodePudding user response：

From what I get about this question, you can just check their indices using index inbuilt to lists to assert if both the user and password are at the same location.

def check_login(user, pasw):
    if user in logins.users and pasw in logins.passes and logins.users.index(user)==logins.passes.index(pasw):
        print('Valid')
    else:
        print('Invalid user and password, try again.')