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Showing content from http://mail.python.org/pipermail/python-dev/2005-March/052185.html below:

[Python-Dev] Rationale for sum()'s design?

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Guido van Rossum wrote:
> I think the conclusion should be that sum() is sufficiently
> constrained by backwards compatibility to make "fixing" it impossible
> before 3.0. But in 3.0 I'd like to fix it so that the 2nd argument is
> only used for empty lists.

Which is not unlike the get() method of dicts. So may be the default 
should be None?

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