Python ‘If not’ syntax [duplicate]

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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?

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