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bpo-37004: Documented asymmetry of string arguments in difflib.SequenceMatcher for ratio method by sweeneyde · Pull Request #13482 · python/cpython · GitHub

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bpo-37004: Documented asymmetry of string arguments in difflib.SequenceMatcher for ratio method #13482

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Merged
miss-islington merged 4 commits into from
Aug 7, 2019
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bpo-37004: Documented asymmetry of string arguments in difflib.SequenceMatcher for ratio method #13482

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a590a97
Warning that SequenceMatcher.ratio() is not commutative
sweeneyde May 22, 2019
a6ab363
Rephrased SequenceMatcher warning and changed example
sweeneyde May 22, 2019
8f2aab8
removed trailing whitespace
sweeneyde May 22, 2019
0683a5f
📜🤖 Added by blurb_it.
blurb-it[bot] May 22, 2019
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10 changes: 10 additions & 0 deletions Doc/library/difflib.rst
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Expand Up @@ -543,6 +543,16 @@ The :class:`SequenceMatcher` class has this constructor:
to try :meth:`quick_ratio` or :meth:`real_quick_ratio` first to get an
upper bound.

.. note::

Caution: The result of a :meth:`ratio` call may depend on the order of
the arguments. For instance::

>>> SequenceMatcher(None, 'tide', 'diet').ratio()
0.25
>>> SequenceMatcher(None, 'diet', 'tide').ratio()
0.5


.. method:: quick_ratio()

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Documentation/2019-05-22-04-30-07.bpo-37004.BRgxrt.rst
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@@ -0,0 +1 @@
In the documentation for difflib, a note was added explicitly warning that the results of SequenceMatcher's ratio method may depend on the order of the input strings.
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