Python If not syntax

Question

I m a bit confused about how why so many python developers use if not in their conditional statements    for example  lets say we had a function    def foo bar   None       if not bar          bar   2   But why go about this way  I mean  wouldn t doing if bar    None or if bar is not Nonebe more explicit  What does if not try to say

User · Accepted Answer

Yes  if bar is not None is more explicit  and thus better  assuming it is indeed what you want  That s not always the case  there are subtle differences  if not bar  will execute if bar is any kind of zero or empty container  or False  Many people do use not bar where they really do mean bar is not None

[python] Python 'If not' syntax

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