在函数结束之前(例如检查失败),在python中退出函数(没有返回值)的最佳方法是什么? [英] What is the best way to exit a function (which has no return value) in python before the function ends (e.g. a check fails)?
问题描述
让我们假设一个迭代,其中我们调用一个没有返回值的函数.我认为我的程序应该表现的方式在以下伪代码中进行了解释:
Let's assume an iteration in which we call a function without a return value. The way I think my program should behave is explained in this pseudocode:
for element in some_list:
foo(element)
def foo(element):
do something
if check is true:
do more (because check was succesful)
else:
return None
do much much more...
如果我在python中实现此功能,则会使我感到困扰,该函数返回None
.是否有更好的方法退出,如果在函数主体中检查失败,则没有返回值"?
If I implement this in python, it bothers me, that the function returns a None
. Is there a better way for "exiting a function, that has no return value, if a check fails in the body of the function"?
推荐答案
您可以简单地使用
return
与
return None
如果执行到达函数主体的末尾而没有命中return
语句,则您的函数也将返回None
.什么也不返回与在Python中返回None
相同.
Your function will also return None
if execution reaches the end of the function body without hitting a return
statement. Returning nothing is the same as returning None
in Python.
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