Paul Moore <lists@morpheus.demon.co.uk> writes:
> So, to offer a unified proposal, I'd suggest the following syntax:
>
> with [ var1 [, var2, ... ] = ] expr1 [, expr2 , ... ]:
> suite
>
> This is equivalent to
>
> var1, var2, ... = expr1, expr2, ...
>
> if hasattr(var1, "__enter__"):
> var1.__enter__()
> if hasattr(var2, "__enter__"):
> var2.__enter__()
> ...
>
> try:
> try:
> suite
>
> except:
> # Handwave here for now
>
> finally:
> ...
> var2.__exit__()
> var1.__exit__()
IMO if you want multiple controllers for a with statement you should
just nest the withs:
with var1 = expr1:
with var2 = expr2:
suite
This makes the order in which the methods of the varN will be called
obvious.
> In this, any varN can be omitted and a dummy hidden variable is
> used.
Meaning something like
with var1, , var3 = expr1, expr2, expr3:
suite
I guess. Urgs. You can't normally omit assignment targets on the left
hand side of a sequence unpacking in python. I don't see why this should
be allowed for with. Nested withs handle this in a cleaner way as well,
IMO.
Bernhard
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