MasterMind

def main():
    from random import randint

    def mastermind():
        print("""
                  _                  _           _
  /\/\   __ _ ___| |_ ___ _ __ /\/\ (_)_ __   __| |
 /    \ / _` / __| __/ _ \ '__/    \| | '_ \ / _` |
/ /\/\ \ (_| \__ \ ||  __/ | / /\/\ \ | | | | (_| |
\/    \/\__,_|___/\__\___|_| \/    \/_|_| |_|\__,_|
        """)

    def getnum():
        numbers = [str(randint(1,9)),str(randint(1,9)),str(randint(1,9)),str(randint(1,9))]
        return numbers

    def getguess():
        listguess = []
        validguess = False

        while validguess == False:
            guess = input("Please guess which four numbers have been selected.\n")
            if guess.isnumeric() == False:
                print("You may only enter four numbers. For example '1234'.\n")
            elif len(guess) != 4:
                print("Your guess may only contain four numbers, no more, no less.\n")
            else:
                guess = list(guess)
                validguess = True
        return guess

    def gameplay():
        mastermind()
        numbers = getnum()
        guess = []
        correctcount = 0
        totalguesses = 0

        print("The numbers have been picked.")
        while guess != numbers:
            guess = getguess()
            for randnum, guessnum in zip(numbers,guess):
                if randnum == guessnum:
                    correctcount += 1
            print("Your guess contained "+str(correctcount)+" correct numbers.\n")
            correctcount = 0
            totalguesses += 1

        print("You guessed correctly, well done.")
        print("The answer you were looking for was","".join(numbers)+".")
        print("It took you a total number of",totalguesses,"guesses.")

    gameplay()
main()