即使存在错误条件，Python Lambda也会返回true [英] Python lambda returns true even with a false condition

问题描述

>>> if lambda x: True == True:
... print('yes')
...
yes
>>> if lambda x: False == True:
... print('yes')
...
yes

推荐答案

您不会像我在评论中解释的那样调用lambda，但是如果要内联，则可以按以下方式进行测试:

You're not calling your lambda as I've explained in my comment, but if you want it inline you can test as:

if (lambda x: True == True)(None):
    print("yes")  # prints

if (lambda x: False == True)(None):
    print("yes")  # doesn't print

或更笼统，因为您实际上没有在lambda中使用任何参数:

Or more general, since you're not actually using any arguments in your lambdas:

if (lambda: True == True)():
    print("yes")  # prints

if (lambda: False == True)():
    print("yes")  # doesn't print

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