Returning True or False vs. True or None

[ichabod801]

I think it's generally best to use the first version and explicitly return False. It's often useful to return True, False, or None, with None representing a situation where the truth value could not be determined for some reason. Explicitly return False makes your True/False functions consistent with that usage.

However, I often use a third case: just return condition. If the condition has a boolean operator, just return it:

def five_or_less(x):
     return x <= 5

But perhaps you were only concerned with conditions without a boolean operator.