On Sat, 29 Mar 2014 17:36:55 -0500, Tim Chase wrote: > And for cases where you have more than one or two things to test for > None-itude, you could use > > if all(x is None for x in [a, b, c, d]): > do_something_if_theyre_all_None() > > or > > if all(x is not None for x in [a, b, c, d]): > do_something_if_no_Nones() > > or > > if not any(x is None for x in [a, b, c, d]): > do_something_if_no_Nones() > > which I find *much* more readable from a maintenance point of view.
With one or two things, I would stick to a regular comparison (skipping the "not"): a is None a is b is None With three, I would consider either idiom: a is b is c is None all(x is None for x in (a, b, c)) but lean towards the use of all(). From four onwards I would definitely use all(), and of course if there is an arbitrary number of items, I would definitely use all(). -- Steven D'Aprano http://import-that.dreamwidth.org/ -- https://mail.python.org/mailman/listinfo/python-list
