[Python-ideas] difflib.SequenceMatcher quick_ratio

floyd floyd at floyd.ch
Mon Jun 8 09:56:41 CEST 2015

Hi *

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


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