import sys

counter = 0
check_failed = True
while check_failed:
    print("Could player 1 enter their username and password")
    username1=input("Please enter your username ")
    password=input("Please enter your password ")
    with open("accountfile.txt","r") as username_finder:
        for line in username_finder:
            if ("username: " + username1 + " password: " + password) == line.strip():
                print("you are logged in")
                check_failed = False
                check_failed = True
                while check_failed:
                    print("Could player 2 enter their username and password")
                    username2=input("Please enter your username ")
                    password=input("Please enter your password ")
                    with open("accountfile.txt","r") as username_finder:
                        for line in username_finder:
                            if ("username: " + username2 + " password: " + password) == line.strip():
                                print("you are logged in")
                                check_failed = False

                        else:
                            print("Sorry, this username or password does not exist please try again")
                            counter = counter + 1
                            if counter == 3:
                                print("----------------------------------------------------")
                                print("You have been locked out please restart to try again")
                                sys.exit()
        else:
            print("Sorry, this username or password does not exist please try again")
            counter = counter + 1
            if counter == 3:
                print("----------------------------------------------------")
                print("You have been locked out please restart to try again")
                sys.exit()