PEP 285: Adding a bool type

[Erik Max Francis]

Alex Martelli wrote:

> The Language Reference manual of the Python language disagrees
> with you.  E.g. at
> http://www.python.org/dev/doc/devel/ref/Booleans.html :
> 
> """
> In the context of Boolean operations, and also when expressions are
> used by control flow statements, the following values are interpreted
> as false: None, numeric zero of all types, empty sequences
> (strings, tuples and lists), and empty mappings (dictionaries).  All
> other values are interpreted as true.
> """

Note that's not complete; it doesn't mention instances of custom classes
which override the __nonzero__ method to return one of these types.

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