使用功能突破while循环 [英] Break out of a while loop using a function

问题描述

有什么方法可以打破使用函数的无限循环吗？例如，

Is there any way to break out of infinite loops using functions? E.g.,

# Python 3.3.2
yes = 'y', 'Y'
no = 'n', 'N'
def example():
    if egg.startswith(no):
        break
    elif egg.startswith(yes):
        # Nothing here, block may loop again
        print()

while True:
    egg = input("Do you want to continue? y/n")
    example()

这会导致以下错误：

SyntaxError: 'break' outside loop

请说明原因

推荐答案

就我而言，您不能在<$范围内调用break c $ c> example（），但您可以使其返回值（例如：布尔值）以停止无限循环

As far as I'm concerned you cannot call break from within example() but you can make it to return a value(eg : A boolean) in order to stop the infinite loop

代码：

yes='y', 'Y'
no='n', 'N'

def example():
    if egg.startswith(no):
        return False # Returns False if egg is either n or N so the loop would break
    elif egg.startswith(yes):
        # Nothing here, block may loop again
        print()
        return True # Returns True if egg is either y or Y so the loop would continue

while True:
    egg = input("Do you want to continue? y/n")
    if not example(): # You can aslo use "if example() == False:" Though it is not recommended!
        break

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