函数不会将布尔值从 true 更改为 false

Question

我正在尝试为快速的事情创建一个交互式故事代码，而我的布尔值似乎没有在我的代码中从 true 变为 false。 这里是：

age = input ("Type in your age")
print("You're bored during quarantine and decide to go visit a haunted house alone. You visit the house, open the door, and walk in.")
print("You are in front of a creepy door in a hallway.")
print("What do you want to do?")
action = input ("Type: in, left, or right. Then click OK or press enter")
survive = False

def survival():
  if age%2 == 0:
    survive = False
  else:
    survive = True
    
survival()

if action == "in":
  print("You choose to go in.")
  print("The room is pitch black")
  if survive == False:
    print("A monster pops out of the corner and eats you!")
  else:
    print("You turn the light on and realize that this is just an old bathroom. Gross.")
if action == "left":
  print("You choose to turn left.")
  print("A ghost appears at the end of the hall.")
  if survive == False:
    print("The ghost chases you down and haunts your soul forever!")
  else:
    print("Your eyes mistook you, it was a spiderweb.")
if action == "right":
  print("You choose to turn right")
  print("A greenish light is visible in the distance")
  if survive == False:
    print("The light gets brighter and brighter, and you realize it was the headlamp of a ghost coal miner!")
  else:
    print("You go to check out the light, turns out it's some old christmas lighting still plugged in.")
    
if survive == False:
  print("May your soul rest eternally as you join the other ghosts at the haunted house.")
else:
  print("You survived your stay at the haunted house and apparently it's just a house.")

您可以看到我正在尝试获取此人的年龄，如果将其除以 2，则将生存设置为 false。但是，无论您输入什么年龄，如果它是偶数或奇数，您仍然会得到生存 = false。有什么可能出错的想法吗？

Answer 1

函数中的变量是局部变量，age 在函数之外。 因此，您需要在函数中使用global 关键字作为

    def survival():
        global age
        global survive
        if age%2 == 0:
            survive = False
        else:
            survive = True

其次，您将年龄输入作为字符串，当您使用运算符时，这将为您提供Type error。您需要将其类型转换为整数
age=int(age) 或 age=int(input())。

最后，我建议你像@juanpa.arrivillaga 所说的那样在函数中传递值：

    def survival():
        age=int(input())
        survive=False

或

    def survival(age,survive=False):

Answer 2

更改这部分代码：

survive = False   # Useless statement -- you replace the value on the following main-program line

def survival():
  if age%2 == 0:
    survive = False    # No need to set a variable; just return the Boolean value
  else:
    survive = True
    
survival()    # Make this line save a return value

到这里：

def survival():
    return age%2 == 1

survive = survival()

另外，我认为您需要更多地练习布尔值。 从不将变量与布尔常量进行比较：改用逻辑运算符。你在哪里

if survive == False:

替换为

if not survive:

更好的是，颠倒你的生存检查逻辑：

def kill_me():
    return age%2 == 0

sudden_death = kill_me()

...

if sudden_death:
    print("Cthulhu rises through the floor; his presence destroys your very soul.")

Answer 3

解决方法如下，希望对你有帮助

age = int(input ("Type in your age\n"))
print("You're bored during quarantine and decide to go visit a haunted house alone. You 
visit the house, open the door, and walk in.")
print("You are in front of a creepy door in a hallway.")
print("What do you want to do?")
action = input ("Type: in, left, or right. Then click OK or press enter\n")

def survival(age=age):
  if age%2 == 0:
    return False
  else:
    return True

if action == "in":
  print("You choose to go in.") 
    if survival() == False:
      print("A monster pops out of the corner and eats you!")
    else:
      print("You turn the light on and realize that this is just an old bathroom. Gross.")
if action == "left":
  print("You choose to turn left.")
  print("A ghost appears at the end of the hall.")
  if survival() == False:
    print("The ghost chases you down and haunts your soul forever!")
  else:
    print("Your eyes mistook you, it was a spiderweb.")
if action == "right":
  print("You choose to turn right")
  print("A greenish light is visible in the distance")
  if survival() == False:
    print("The light gets brighter and brighter, and you realize it was the headlamp of a ghost coal miner!")
  else:
    print("You go to check out the light, turns out it's some old christmas lighting still plugged in.")

if survival() == False:
  print("May your soul rest eternally as you join the other ghosts at the haunted house.")
else:
  print("You survived your stay at the haunted house and apparently it's just a house.")

Answer 4

只需在您的代码中编辑以下内容。

1. 您将年龄输入为字符串。在 Python 中，input() 返回字符串 值。您应该将输入值转换为整数。为此，您可以使用 int() 方法。

   age = int(input ("输入你的年龄"))

或者，

age = input ("Type in your age")
age = int(age)

1. 您在生存功能中使用年龄和生存。但两者都是在生存函数之外定义的。因此使用 global 关键字在生存功能中使用它们。所以，代码应该修正如下，

def survival():
  global survive
  global age
  if age%2 == 0:
    survive = False
  else:
    survive = True