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Tue Mar 15 16:58:51 CET 2005 · https://mail.python.org/pipermail/python-dev/2005-March/052194.html

[Guido van Rossum]

#- > 1. When omitting the second argument, would supplying an 
#- empty list return 0,
#- > None or raise an exception?
#- 
#- Good question...

I'd go for None:

- Is a good default for a non-existing argument.

- If won't get None from sum() in other case (unless you do sum(None), but
you should be aware of that).

.    Facundo

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