Question

这是我的代码到目前为止，我不知道为什么变量在我循环代码时没有加起来。

import random
player1=1
player2=1
print("Welcome To My Board Game")

def dice_roll():
    dice1=random.randint(1,6)
    dice2=random.randint(1,6)
    print("Your first roll is",dice1)
    print("Your second roll is",dice2)
    total_dice=(dice1+dice2)
    print("Your total is",total_dice)
    print("You moved",total_dice,"spaces, to space",player1+total_dice )



while True:
    print("Player 1 Turn")
    choice=input("Do you want to roll the dice press r ")
    if choice.lower()=="r":
        dice_roll()

这是我的代码

的输出

Welcome To My Board Game
Player 1 Turn
Do you want to roll the dice press r r
Your first roll is 6
Your second roll is 5
Your total is 11
You moved 11 spaces, to space 12
Player 1 Turn
Do you want to roll the dice press r r
Your first roll is 4
Your second roll is 5
Your total is 9
You moved 9 spaces, to space 10
Player 1 Turn
Do you want to roll the dice press r

移动空间部分应该从最后一部分添加

Answer 1

将global与var player1一起使用，并每次更改。

def dice_roll():
    dice1=random.randint(1,6)
    dice2=random.randint(1,6)
    print("Your first roll is",dice1)
    print("Your second roll is",dice2)
    total_dice=(dice1+dice2)
    print("Your total is",total_dice)
    global player1
    player1 += total_dice
    print("You moved",total_dice,"spaces, to space",player1)

参考：
The global statement
Python Scopes and Namespaces

修改
更进一步，您可以定义一个类：

import random class player: def __init__(self, init_space=1): self.space = init_space def dice_roll(self): dice1 = random.randint(1,6) dice2 = random.randint(1,6) print("Your first roll is",dice1) print("Your second roll is",dice2) total_dice = (dice1 + dice2) print("Your total is",total_dice) self.space += total_dice print("You moved",total_dice,"spaces, to space", self.space) player1 = player() player2 = player() print("Welcome To My Board Game") while True: print("Player 1 Turn") choice = input("Do you want to roll the dice press r ") if choice.lower() == "r": player1.dice_roll()

当有更多玩家时，使用课程会让事情变得更容易。

Answer 2

问题是，当函数返回时，dice1，dice2和total_dice被“销毁”。这些变量是在函数范围内定义的，因此它们不能在函数外部使用。有两种方法可以访问函数内的变量：

更改全局变量，然后在其他地方读取全局变量。 @ yi_xiao的答案显示了这个例子。
传入一些数据，并返回一些数据。

通常，您应该总是更喜欢返回值而不是改变（更改）全局变量。使用全局变量会使测试变得更难，如果您需要一次从多个线程访问数据，则会成为问题。

要修复您的代码，您应该从total_dice返回dice_roll，然后传递旧的总数：

import random
player1=1
player2=1
print("Welcome To My Board Game")

# Pass the old total in as total_dice
def dice_roll(total_dice):
    dice1=random.randint(1, 6)
    dice2=random.randint(1, 6)

    print("Your first roll is", dice1)
    print("Your second roll is", dice2)

    # Increase the running total sum
    total_dice += dice1 + dice2 

    print("Your total is", total_dice)
    print("You moved", total_dice, "spaces, to space", player1 + total_dice)

    # Return the sum
    return total_dice


# Note, in this simple example, sum is actually global.
# In more realistic cases, this would be inside of a function
#  instead of being global 
sum = 0

while True:
    print("Player 1 Turn")
    choice = input("Do you want to roll the dice press r ")
    if choice.lower() == "r":
        # Pass sum to dice_roll
        # Reassing sum to the new sum given to us by dice_roll
        sum = dice_roll(sum)

另请注意，目前，您的循环不会退出。即使有人输入“r”以外的东西，循环也不会退出，你需要告诉它退出。您可以使用break，也可以从无限循环更改为while True以外的其他内容。

我不知道为什么变量没有加起来

2 个答案: