What values are considered false?

[Erik Max Francis]

Andrew Dalke wrote:

> Not quite.  You called the fuction 'foo', which doesn't
> define a return value so the value None is used instead.
> To compare the function to None, do
> 
>   foo is None
> 
> and you'll get 0.

Which really shouldn't be surprising, since a function that doesn't do
anything except return None is not the same thing as None.

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