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Date: Sat, 29 Mar 2014 17:36:55 -0500
From: Tim Chase <python.list@tim.thechases.com>
To: Roy Smith <roy@panix.com>
Subject: Re: checking if two things do not equal None
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On 2014-03-29 17:07, Roy Smith wrote:
> > if (a is not None) or (b is not None):
> > 
> > is immediately understandable by everyone?  
> 
> I agree with that.  But
> 
> > if (a, b) != (None, None):  
> 
> seems pretty straight-forward to me too.  In fact, if anything, it
> seems easier to understand than

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.

-tkc