如何执行两个python列表的逐元素子结构？

Question

我正在尝试创建一个新列表，执行两个 python 列表的逐元素子结构，如下所示：

from operator import add

number_villains_players = 0
villain_strength = []
player_strength = []
resulten_strength = []

def get_villain_strength(size):
    villain_strength = [int(x) for x in input("Enter {} numbers of space separated strength of Villains:".format(size)).split()]
    print(villain_strength)

def get_player_strength(size):

    player_strength = [int(x) for x in input("Enter {} numbers of space separated energy of Players:".format(size)).split()]
    print(player_strength)

def compare_strength():
    #resulten_strength = [m-n for (m,n) in zip(player_strength,villain_strength)]     #doesn't work
    #resulten_strength = [sum(x) for x in zip(player_strength, villain_strength)]     #doesn't work
    #resulten_strength = [list( map(add, player_strength, villain_strength) )]     #doesn't work
    resulten_strength = [a*b for a,b in zip(player_strength,villain_strength)]     #doesn't work
    print(resulten_strength)

def main():
    number_villains_players = input("How many Players/Villains?:")
    get_villain_strength(number_villains_players)
    get_player_strength(number_villains_players)
    compare_strength()
    if (i > 0 for i in resulten_strength):
        print("WIN")
    else:
        print("LOSE")

main()

但print(resulten_strength)始终为空作为[]或[[]]

我遵循了以下所有可能的解决方案：

• 按元素添加 2 个列表？
• 如何在python中以数学方式减去两个列表？[复制]
• 如何在 Python 中执行两个列表的元素乘法？

谁能指出我哪里出错了？

Answer 1

您在方法中分配本地列表，它们不是全局的。因此定义的顶行总是空的。这应该可以解决您的问题：

def get_villain_strength(size):
    global villain_strength
    villain_strength = [int(x) for x in input("Enter {} numbers of space separated strength of Villains:".format(size)).split()]
    print(villain_strength)

然而，在任何地方使用全局变量都是不好的。你可能想要一个有返回值的函数。

当您在函数内分配相同名称的变量时，它将覆盖全局变量的名称，直到您从函数返回。或者说如果你查找一个变量，它首先在 中查找名称locals()，如果没有找到，它会去globals()。如果仍然没有找到，则会引发异常。