Python：如果while条件在循环期间发生变化，如何在while循环运行时结束它？

Question

I need some help with code in a text based game I am trying to make. My game uses health, and the code starts off with "while health>0:", and in another point in the game, when health eventually =0, the loop still continues. How do I make the loop end when health=0, without finishing the whole loop.

Here is an example:

health=100
while health>0:
  print("You got attacked")
  health=0
  print("test")

Should the code not be stopping when health=0, and not print "test"? How to I get it to stop when health=0? The code I wrote deducts health based on the users actions, so the times when health=0 can vary. I want to end the code whenever health=0 Any help would be appreciated.

Answer 1

The condition is only evaluated at the start of each iteration . It does not get checked in the middle of an iteration (eg as soon as you set to health to zero).

To explicitly exit the loop, use break :

while health>0:
  ...
  if some_condition:
    break
  ...

Answer 2

与 C 中一样， break语句从最小的for或while循环中跳出。

Answer 3

You should use 'break' statement to come out of the loop

health=100
while health>0:
  print("You got attacked")
  # decrement the variable according to your requirement inside the loop
  health=health-1 
  if health==0:
    break
  print("test")

Answer 4

Cleaner implementation

health = 100
while True:
    if (health <= 0): break
    print ("You got attacked!")
    health = 0
    print ("Testing!")

Outputs:

You got attacked!
Testing!

Answer 5

In a while loop, you can only get your code to stop if you specify some sort of condition. In this case, health is always greater than 0, so it keeps printing "you got attacked". You need to make the health variable decrease till it gets to 0 in order to print "test". Hence;

  `   health=100
      while health>0:
        print("You got attacked")
        health-=5
        if health==0:
         print("test")
         break`

An alternative could be this also;

    `  health=100
      if health>0:
       print("You got attacked")
      if health==0:
       print("test") `