[Python-Dev] bool(iter([])) changed between 2.3 and 2.4

Guido van Rossum guido at python.org
Wed Sep 21 01:34:09 CEST 2005

On 9/20/05, Delaney, Timothy (Tim) <tdelaney at avaya.com> wrote:
> In any case, it's simple to get the 2.3 behaviour back - just add
> __nonzero__. I think that could validly be considered a bugfix.

Alas not -- it would still be a functionality change relative to 2.4 and 2.4.1.

Also, an object whose __len__() returns 0 but whose __nonzero__()
returns True would be an anomaly.

The best we can do IMO is to change it back in 2.5.

--Guido van Rossum (home page: http://www.python.org/~guido/)

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