PEP 285: Adding a bool type

[Erik Max Francis]

Steve Holden wrote:

> *My* point, however badly I originally made it, was that writing
> 
>     if ret == None:
> 
> is *sometimes* like writing
> 
>     if (a == 3) == True:
> 
> assuming this new wart appears in Python.

Comparing to None (preferably via is rather than ==, since == can be
overridden to do strange things) is perfectly legitimate when an API
declares that a function or method returns "an object or None."  After
all, the __nonzero__ method can be overridden to make perfectly valid
objects evaluate to false in a truth test.

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