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] > 0:
> pass
>
> =====OR=====
>
> if x:
> if x[0] > 0:
> pass
>
>
> In the first, I'm obviously making the assumption that if the first
> condition evaluates to false, then the second condition won't be evaluated.
> But, is this a good/valid assumption to make? Is there a more appropriate
> design pattern in Python?
>
> Thanks!
> Orest
>
What about exceptions ?
try :
if x[0] > 0:
pass # process the item
except :
pass # or do whatever you want if there's no item
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