[Patches] [ python-Patches-724936 ] new sum builtin

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Patches item #724936, was opened at 2003-04-21 06:33
Message generated for change (Comment added) made by gvanrossum
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Category: Core (C code)
Group: Python 2.3
Status: Open
Resolution: None
Priority: 7
Submitted By: Alex Martelli (aleax)
Assigned to: Guido van Rossum (gvanrossum)
Summary: new sum builtin

Initial Comment:
as per discussion on Python-Dev.  Note that 
sum(manystrings), while still FAR faster than 
reduce(operator.add, manystrings) and the equivalent loop, 
is now about twice as slow as ''.join(manystrings) -- to 
support  the possibility that "manystrings" may be an 
iterator, sum must retain the first item and 
string-concatenate to it the ''.join of the others.  I have not 
mentioned this slight performance hit in the docs (just as 
the far more severe performance trap with 
reduce(operator.add, manystrings) is nowhere mentioned).  
Also, I have not edited the tutorial.  Please let me know if 
you want more editing of such docs, I'll be quite glad to do 
it, of course!


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>Comment By: Guido van Rossum (gvanrossum)
Date: 2003-04-21 08:21

Message:
Logged In: YES 
user_id=6380

I have to rethink the idea that sum() should only apply to
numbers. The discussion brought up some new good points that
I need to ponder.

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