为什么我的模块在 Python 中运行两次

Question

我正在创建一个基于文本的冒险游戏以使用 Python 进行练习，这是我的代码。

#game.py
import time
import encounter

#Hp at start of game
hp = 100

#Function to display the current hp of the current player
def currenthp(hp):
    if hp < 100:
        print "Your hp is now at %d" % hp
    elif hp <= 0:
        dead()
    else:
        print "You are still healthy, good job!"

print "You start your regular trail."
print "It will be just a little different this time though ;)"

#Start of game
time.sleep(3)
print "You are walking along when suddenly."
time.sleep(1)
print "..."
time.sleep(2)

#Start of first encounter
print "Wild bear appears!."
print "What do you do?"
print "Stand your ground, Run away, be agressive in an attempt to scare the bear"

#first encounter
encounter.bear(hp)

为了整洁，我把我所有的遭遇都放在一个单独的脚本中。这是遭遇脚本。

import time

#Bear encounter
def bear(hp):
    import game
    choice = raw_input("> ")
    if "stand" in choice:
        print "The bear walks off, and you continue on your way"
    elif "run" in choice:
        print "..."
        time.sleep(2)
        print "The bear chases you and your face gets mauled."
        print "You barely make it out alive, however you have sustained serious damage"
        hp = hp-60
        game.currenthp(hp)
    elif "agressive" in choice:
        print "..."
        time.sleep(2)
        print "The bear sees you as a threat and attacks you."
        print "The bear nearly kills you and you are almost dead"
        hp = hp-90
        game.currenthp(hp)
    else:
        print "Well do something!"

好吧，这一切都很方便，除了一件事。当我的程序到达它要求玩家回答遇到脚本中的熊时，它会做什么的部分时，整个游戏脚本将重新启动。但是，这一次，程序将正常运行。这有什么原因吗，还是我只需要处理它？

Answer 1

您的代码具有循环依赖项：game导入encounter和encounter导入game。您在模块范围内也有很多逻辑game；模块级逻辑在第一次导入模块时被评估——但是，一个模块直到它的所有代码都被评估后才完成导入，所以如果你最终在模块定义代码的过程中再次导入模块，奇怪的事情发生。

首先，没有模块级代码——使用if __name__ == "__main__":块。这意味着您的代码不会在导入时运行，只有在您需要时才会运行。

请参阅if __name__ == "__main__": do?

其次，不要循环导入——如果您需要共享逻辑并且无法证明将其保留在导入的模块中，请创建由两者导入的第三个模块。不过，在这里，您似乎可以移动current_hp到encounter并删除import gamefrom encounter。