How to do while loop until my output has reached-CodePudding

I have a password verifier and I have made it that when there is less than 6 digits to change a variable called "invalid" to 1 and if it is is more than 16 digits to change a variable called "invalid" to 1. How do I make it that when the variable is one for it to run the code again and if it is on zero for it to stop. Is there a way to start the code again when the invalid variable is one?

CodePudding user response：

Initialize a variable to check if the conditions are met. The while loop will run until password is of right size

check = 1
while check == 1:
    input = input('Give your password')
    if 6 < len(input) < 16:
        check = 0

CodePudding user response：

You can add some if-statements. You can use the "break" statement to break out of the loop. Meaning that when "break" is executed the loop will no longer be executed. I don't know what your code looks like but you could do something like this.

if invalid == 0:
    break

CodePudding user response：

invalid = True
while(invalid):
    # your code here, accept/recheck password
    if not(len(password)<6 or len(password)>16):
        invalid = False # passw valid, breaks before next iteration

True and False would seem like better alternatives to 0 and 1 for your application, would still work either way if you choose to use 0 and 1

CodePudding user response：

This is how I would do it, after reading your current code:

import re

print("""
    Your password needs to have the following:
    
    At least 1 lowercase character

    At least 1 uppercase character

    1 of these special characters ($#@)

    Has to have a minium of 6 characters and a maximum of 16 characters
""")

invalid = 1
while invalid:
    password = input("Please input a Password: ")
    if len(password)<6 or len(password)>16:
        print("Password length invalid, please try again")
    elif not any(x in password for x in {"$","#","@"}):
        print("Password must contain one of these special characters: $#@, please try again")
    elif not re.search(r"[A-Z]", password) or not re.search(r"[a-z]", password):
        print("Password must contain at least one capital and one lower case character, please try again")
    else:
        print("Password valid")
        invalid = 0

Result:

    Your password needs to have the following:

    At least 1 lowercase character

    At least 1 uppercase character

    1 of these special characters ($#@)

    Has to have a minium of 6 characters and a maximum of 16 characters

Please input a Password: hejhejhejhejhejhejhejhej
Password length invalid, please try again
Please input a Password: hej
Password length invalid, please try again
Please input a Password: hejhejhej
Password must contain one of these special characters: $#@, please try again
Please input a Password: hejhejhej#
Password must contain at least one capital and one lower case character, please try again
Please input a Password: Hejhejhej#
Password valid