As an aside only, it would be pretty reasonable IMO to have name = value if condition and set name to None otherwise But I'm -1 on the idea as I think it's a bit redundant. Cheers, -T On Wed, Apr 8, 2009 at 12:55 AM, spir <denis.spir@free.fr> wrote:
Le Tue, 7 Apr 2009 23:38:21 +1000, Steven D'Aprano <steve@pearwood.info> s'exprima ainsi:
What's the reason why name = value if condition is invalid? Meaning: there _must_ be an else clause.
Because "value if condition else other" is an expression, not a statement, and thus *must* have a value.
name = value if condition
only has a value sometimes, and so is invalid [...]
Yes, thank you! That's the explaination I was looking for. I meant to use the above formulation for updating already defined variables. Indeed, python does not make the difference I have in mind ;-).
As a side note, if condition: name = value (where 'name' is already registered) is the only case when I do not indent a block, for the reason that it means for me the same as the above invalid one-liner.
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