import time
complete = False
user = [["username",""],["password",""]]

def Access():
    for n in range (len(user)):
        user[n][1] = input(user[n][0])

while not complete:
    Access()
    username = input("Reinput the username?")
    password = input("Reinput the password?")

    if username == user[0][0]:
        print("Good!")#what i want it to print if correct
    else:
        print("Input details again!")#what it keeps printing no matter what
    if password == user[1][1]:
        print("User has been identified, Welcome", username)
        complete = True
        break