I was taking a computer science class, and I was tasked to create a program that implemented a function which took parameters. My teacher told me that the following code is not a function leaving me confused as to what is necessary for some lines of code to be classified as a “function”.

def game(numbers, max_turns, pfl, tgl):
    turns=0
    flag=False
    print("You have "+str(max_turns)+" turns to guess the number. Let's start!")
    while turns<max_turns:
        guess=int(input("Enter your guess: "))
        if guess==numbers:
            pfl.append("Passed")
            tgl.append(max_turns)
            flag=True
            print("You got it right! Try to make it a little harder!")
            break
        elif guess<numbers:
            print("Higher")
            turns=turns+1
        else:
            print("Lower")
            turns=turns+1
    if flag==False:
        pfl.append("Failed")
        tgl.append(max_turns)
        print("You failed! Maybe give yourself more chances next time? The number was "+str(number))

I had also been able to call it like any normal function many times in the program:
game(number, turn, passfail, turnsgiven)
game(number, randomturn, passfail, turnsgiven)

I assumed that this was a function as I defined it as one and was able to call it like any normal function wherever necessary, but my teacher said this was not a function.