Friday, September 14, 2018

kids these days think data structures grow on trees

Args and kwargs are great features of Python.  There is a measurable (though highly variable) cost of them however:

>>> timeit.timeit(lambda: (lambda a, b: None)(1, b=2))

>>> timeit.timeit(lambda: (lambda *a, **kw: None)(1, b=2))

>>> timeit.timeit(lambda: (lambda *a, **kw: None)(1, b=2)) - timeit.timeit(lambda: (lambda a, b: None)(1, b=2))

Constructing that dict and tuple doesn't happen for free:

>>> timeit.timeit(lambda: ((1,), {'b': 2})) - timeit.timeit(lambda: None)

Specifically, it takes about 1/5,000,000th of a second.


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