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Showing content from https://mail.python.org/pipermail/python-dev/2008-May/079807.html below:

[Python-Dev] optimization required: .format() is much slower than %

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Christian Heimes wrote:
> Antoine Pitrou schrieb:
>> In order to avoid memory consumption issues there could be a centralized cache
>> as for regular expressions. It makes it easier to handle eviction based on
>> various parameters, and it saves a few bytes for string objects which are never
>> used as a formatting template.
> 
> Good idea!
> I suggest you hook into the string interning code and use a similar
> approach.

I don't think parsing the strings is where it spends its time.  I think 
the time is spent in object creation, __format__ lookup, and building 
the result.  I'm looking into some of these other optimizations now.

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