python - 从子函数中的父函数返回

Question

我知道在函数中你可以使用return退出函数，

def function():
    return

但是你能从子函数中退出父函数吗？

例子:

def function()
    print("This is the parent function")

    def exit_both():
        print("This is the child function")
        # Somehow exit this function (exit_both) and exit the parent function (function)

    exit_both()
    print("This shouldn't print")

function()
print("This should still be able to print")

---

我尝试引发一个Exception，如this answer建议，但这只会退出整个程序。

Answer 1

您可以从 exit_both 引发异常，然后在您调用 function 的地方捕获它以防止程序退出。我在这里使用自定义异常，因为我不知道合适的内置异常并且要避免捕获 Exception 本身。

class MyException(Exception):
    pass

def function():
    print("This is the parent function")

    def exit_both():
        print("This is the child function")
        raise MyException()

    exit_both()
    print("This shouldn't print")

try:
    function()
except MyException:
    # Exited from child function
    pass
print("This should still be able to print")

输出:

This is the parent function
This is the child function
This should still be able to print