On 2009-03-06, Fencer <no.s...@plz.ok> wrote:
> Hi, I need a boolean b to be true if the variable n is not
> None and not an empty list, otherwise b should be false.
> I ended up with:
> b = n is not None and not not n
I'd do it like this:
b = (n is not None) and (n != [])
Your code doesn't meet your stated requirement. Your code
incorrectly evaluates to False if n is any of the following:
(,)
{}
False
0
0.0
Your stated requirement is for b to be True for all those cases.
> which seems to work
>
> but is that normally how you would do it?
>
> It can be assumed that n is always None or a list that might
> be empty
Well then, that's different. :)
Still, I'd do it my way. I don't like assumptions.
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