print ("Welcome, please log in below to use this application")

Username = "seanboyd"
Password = "password"



def username(username):
    promptusername = input("Enter Username: ")
    return promptusername

def main():
    print("Welcome to the main page")

def mainLogin():
    if username(username) == Username:
        print("login successfull")
        main()
    elif username(username) != Username:
        print ("login failed, try again")
        mainLogin()

mainLogin()



And this is the results of when I run it in pycharm. As you can see it wont fail on the first bad username:

Welcome, please log in below to use this application
Enter Username: dhdgdd
Enter Username: dgddgd
login failed, try again
Enter Username: