在 Python function 中返回 boolean 的首选方法是什么？

Question

Is one of these preferred over the other?

1)

def even(num):
    if num % 2 == 0:
        return True
    else:
        return False

2)

def even(num):
    return num % 2 == 0

I prefer #2, but I can see why people might like #1 too.

Answer 1

There is no definitiv answer, it's just about preference.

Answer 2

There is also this way:

def even(num):
    if num % 2 == 0:
        return True
    return False

In general try to be consistent with the coding-style of the rest project. But, explicit is better than implicit . Imagine that during the comparison an exception occurs... Have you handled the exception on the caller? if not then you might have to handle the exception here, and then return a bool value (probably false).