[Tutor] evaluating AND
adam.jtm30 at gmail.com
Fri Sep 14 00:15:50 CEST 2007
On 13/09/2007, Terry Carroll <carroll at tjc.com> wrote:
> On Thu, 13 Sep 2007, Orest Kozyar wrote:
> > Given a variable x that can either be None or a tuple of two floats [i.e
> > (0.32, 4.2)], which syntax is considered most appropriate under Python
> > coding standards?
> > if x and x > 0:
> > pass
> > =====OR=====
> > if x:
> > if x > 0:
> > pass
> I would like either one if instead of "if x" you used "if x is not None";
> that seems a lot easier to me to read. It's a bit jarring to see the same
> variable used in one expression as both a boolean and a list/tuple.
> Besides, suppose somehow x got set to zero. It would pass without error,
> something you wouldn't want to have happen. Even if you've set things up
> so that it couldn't happen, it's not obvious from looking at this code
> that it couldn't happen.
> If you really want to test for x being non-None, test for x being
The problem is what if it's an empty list or tuple? It would pass but have
whereas if x would work fine.
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