Python 错误 : UnboundLocalError: local variable 'score1' referenced before assignment

Question

我正在尝试制作一个简单的掷骰子游戏，其中两名玩家在五轮内掷一次骰子，得分最高的人获胜。

我已经尝试在函数内和函数外将 score1 变量设置为 0，但这将导致分数每次都重置为 0。

#setting the scores as 0 before.
score1=0
score2=0

def round1():
    print('Round 1, lets go')
    input("Player 1 press ENTER to roll dice")
    diceroll1()
    input("Player 2 press ENTER to roll dice")
    diceroll2()
    round2()
#Round 1, calls upon dice roll functions and.

#dice roll function for player 1
def diceroll1():
    import random
    number = random.randint(1,6)
    print("Your number is: " + str(number))
    if number % 2 == 0:
        number = number + 10
        score1 = score1 + number
        print("Your new score is: " + str(score1))
    else:
        number = number - 5
        score1 = score1 + number
        print("Your new score is: " + str(score1))
    if score1 < 0:
        score1 = 0
    else:
        score1=score1

#dice roll function for player 2
def diceroll2():
    import random
    number = random.randint(1,6)
    print("Your number is: " + str(number))
    score2
    if number % 2 == 0:
        number = number + 10
        score2 = score2 + number
        print("Your new score is: " + str(score2))
    else:
        number = number - 5
        score2 = score2 + number
        print("Your new score is: " + str(score2))
    if score2 < 0:
        score2 = 0
    else:
        score2=score2

我希望它简单地将骰子值添加到分数中，但出现此错误:

UnboundLocalError: local variable 'score1' referenced before assignment

Answer 1

您应该使用global 标识符。

关于代码的一些说明:

1. 导入应该在代码的顶部。而且一个库导入一次就够了。
2. 您不必将变量的值重新定义为它自己的值。像这样 score2 = score2。只是不要这样做。
3. 我建议您使用 while 循环来无限地进行游戏，或者使用 for 循环进行 const 轮数。
4. 检查您的代码并计算重复项。他们有很多。尽量减少数量。

我修改了您的代码并在其中留下了一些有趣的功能，这对您将来和现在都有帮助。

from random import randint


#setting the scores as 0 before.
score1=0
score2=0


#dice roll function for player 1
def diceroll1():
    global score1
    import random
    number = randint(1,6)
    print(f"Your number is: {str(number)}")

    number += - 5 if number % 2 else 10
    score1 += number

    if score1 < 0:
        score1 = 0

    print(f"Your new score is: {str(score1)}")


#dice roll function for player 2
def diceroll2():
    global score2
    import random
    number = randint(1,6)
    print(f"Your number is: {str(number)}")

    number += - 5 if number % 2 else 10
    score2 += number

    if score2 < 0:
        score2 = 0

    print(f"Your new score is: {str(score2)}")


def game_loop():
    for _ in range(int(input("Raound number: "))):
        print('Round 1, lets go')
        input("Player 1 press ENTER to roll dice")
        diceroll1()
        input("Player 2 press ENTER to roll dice")
        diceroll2()
        print()


if __name__ == "__main__":
    game_loop()

接下来，尝试将这两个功能合二为一。