On 6/30/10 11:39 AM, Stef Mientki wrote:
hello,
I've lot of functions that returns their result in some kind of tuple /
list / array,
and if there is no result, these functions return None.
Now I'm often what to do something if I've more than 1 element in the
result.
So I test:
if len ( Result ) > 1 :
But to prevent exceptions, i've to write ( I often forget)
if Result and ( len ( Result ) > 1 ) :
Just do:
if Result:
You don't have to do a length check > 1; because if Result has a length
of 0, it'll be false too. So the above check will catch both None, and
empty sequences.
So I wonder why len is not allowed on None
and if there are objections to extend the len function .
Len is not allowed on None, becaues None is not a sequence, and doesn't
have a length. None, *very* much on purpose, is distinct and does not
behave like anything else. It's the "I'm not anything" object.
--
... Stephen Hansen
... Also: Ixokai
... Mail: me+list/python (AT) ixokai (DOT) io
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