[Python-ideas] difflib.SequenceMatcher quick_ratio

Serhiy Storchaka storchaka at gmail.com
Mon Jun 8 10:44:38 CEST 2015

On 08.06.15 10:56, floyd wrote:
> I use this python line quite a lot in some projects:
> if difflib.SequenceMatcher.quick_ratio(None, a, b) >= threshold:
> I realized that this is performance-wise not optimal, therefore wrote a
> method that will return much faster in a lot of cases by using the
> length of "a" and "b" to calculate the upper bound for "threshold":
> if difflib.SequenceMatcher.quick_ratio_ge(None, a, b, threshold):
> I'd say we could include it into the stdlib, but maybe it should only be
> a python code recipe?
> I would say this is one of the most frequent use cases for difflib, but
> maybe that's just my biased opinion :) . What's yours?
> See http://bugs.python.org/issue24384

If such function will be added, I think it needs better name. E.g. 
difflib.isclose(a, b, threshold).

More information about the Python-ideas mailing list