Why is this while loop running endlessly?

June 12, 2022


def get_password():
    password = passwd() #returns None when no input is given else return password
    if password is not None:
        if len(password)<7:
            print("Minimum length of password is 6. Please try again.")
            password = None
        elif len(password)>16:
            print("Maximum length of password is 16. Please try again.")
            password = None
        while password is None:
            get_password()
    return password

I want to run this function again and again until users inputs a valid password. If user gives a valid password then while loop should not be entered but even then the loop is getting executed endlessly.

>Solution :

Don’t use recursivity to have a logic of "do that again", because when you need to stop it, recursivity is for specific problems

Use a main loop based on password is None, then call passwd and apply your rules

def get_password():
    password = None
    while password is None:
        password = passwd()  # returns None when no input is given else return password
        if password is not None:
            if len(password) < 7:
                print("Minimum length of password is 6. Please try again.")
                password = None
            elif len(password) > 16:
                print("Too Long", "Maximum length of password is 16. Please try again.")
                password = None
    return password