hasattr

Python’s hasattr on list values of dictionaries always returns false?

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hasattr does not test for members of a dictionary. Use the in operator instead, or the .has_key method: >>> example = dict(foo=’bar’) >>> ‘foo’ in example True >>> example.has_key(‘foo’) True >>> ‘baz’ in example False But note that dict.has_key() has been deprecated, is recommended against by the PEP 8 style guide and has been removed … Read more

hasattr() vs try-except block to deal with non-existent attributes

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Any benches that illustrate difference in performance? timeit it’s your friend $ python -mtimeit -s ‘class C(object): a = 4 c = C()’ ‘hasattr(c, “nonexistent”)’ 1000000 loops, best of 3: 1.87 usec per loop $ python -mtimeit -s ‘class C(object): a = 4 c = C()’ ‘hasattr(c, “a”)’ 1000000 loops, best of 3: 0.446 usec … Read more

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