On Mon, Oct 04 2010, Nitin Dahra wrote:
[...]
> Apparently, 'in' is also faster than 'has_key'
[...]
A few quick numbers.
In [2]: foo = {} # Without the key
In [12]: timeit.timeit(lambda: 2 in foo)
Out[12]: 0.2220299243927002
In [13]: timeit.timeit(lambda: foo.has_key(2))
Out[13]: 0.32393407821655273
In [14]: foo = {2 : "Hello"} # With the key
In [15]: timeit.timeit(lambda: 2 in foo)
Out[15]: 0.21776700019836426
In [16]: timeit.timeit(lambda: foo.has_key(2))
Out[16]: 0.3091580867767334
Also, "in" works for iterables other than dict's whereas has_key
doesn't. Better duck typing.
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