restriction on sum: intentional bug?

Tim Chase python.list at
Sat Oct 17 11:28:36 CEST 2009

Christian Heimes wrote:
> Alan G Isaac wrote:
>> On 10/16/2009 5:03 PM, Christian Heimes wrote:
>>> It's not going to happen.
>> That's a prediction, not a justification.
> It's not a prediction, it's a statement. It's not going to happend
> because it violates Guido's gut feeling as well as the Zen of Python.

I'm not sure how it violates ZoP...particularly

Simple is better than complex.
   [complex is special casing or explaining why there's an error]
Special cases aren't special enough to break the rules.
   [raising an error is a special case]
Although practicality beats purity.
In the face of ambiguity, refuse the temptation to guess.
   [there's nothing ambiguous about sum() meaning "+"]
If the implementation is easy to explain, it may be a good idea.
   [sum(lst_of_strs) should do exactly what it says..."+" 'em]


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