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April 8, 2019 17:11
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In [1]: import timeit | |
In [4]: class A(object): | |
...: pass | |
...: | |
In [5]: item = object() | |
In [6]: item_a = A() | |
In [7]: def descendent_isinstance(): | |
...: return isinstance(item_a, object) | |
...: | |
In [8]: def direct_isinstance(): | |
...: return isinstance(item_a, A) | |
...: | |
In [9]: def direct_isinstance_builtin(): | |
...: return isinstance(item, object) | |
...: | |
In [10]: def not_isinstance(): | |
...: return isinstance(item, A) | |
...: | |
In [11]: descendent_isinstance() | |
Out[11]: True | |
In [12]: direct_isinstance() | |
Out[12]: True | |
In [14]: direct_isinstance_builtin() | |
Out[14]: True | |
In [15]: not_isinstance() | |
Out[15]: False | |
In [17]: tests = { | |
...: "descendent_isinstance": descendent_isinstance, | |
...: "direct_isinstance": direct_isinstance, | |
...: "direct_isinstance_builtin": direct_isinstance_builtin, | |
...: "not_isinstance": not_isinstance, | |
...: "item": item, | |
...: "item_a": item_a, | |
...: "A": A, | |
...: } | |
In [18]: timeit.repeat(stmt="descendent_isinstance()", globals=tests) | |
Out[18]: | |
[0.18606656999997995, | |
0.17976311300003545, | |
0.17793933600000855, | |
0.17901940199999444, | |
0.1791184380000459] | |
In [19]: timeit.repeat(stmt="direct_isinstance()", globals=tests) | |
Out[19]: | |
[0.16835473799994816, | |
0.16796777699994436, | |
0.16732346500009498, | |
0.1671851889999516, | |
0.1646581120000974] | |
In [20]: timeit.repeat(stmt="direct_isinstance_builtin()", globals=tests) | |
Out[20]: | |
[0.17491985099991325, | |
0.17345420999993166, | |
0.17239584300000388, | |
0.1734395940000013, | |
0.17397786800006543] | |
In [21]: timeit.repeat(stmt="not_isinstance()", globals=tests) | |
Out[21]: | |
[0.19989036399999804, | |
0.1967721519999941, | |
0.1962455799999816, | |
0.19687672300005943, | |
0.19701133199998822] |
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