if statement in for loop

[Ryan Lowe]

i thought id ask here before wirting a PEP, if people thought it would be a
good enhancement to allow if clauses in regular for-statements like so:
[color=blue][color=green][color=darkred]
>>> for x in y if x < 10 :[/color][/color][/color]

is semantically equivalent to
[color=blue][color=green][color=darkred]
>>> for x in [x for x in y if x < 10] :[/color][/color][/color]

but is shorter and easier to read. basically, the if works as a filter for
the values in the iterator. its not a major change, purely syntactic sugar.
and clearly backwards-compatible.

seem reasonable?

ryan

[Peter Hansen]

Re: if statement in for loop

Ryan Lowe wrote:[color=blue]
>
> i thought id ask here before wirting a PEP, if people thought it would be a
> good enhancement to allow if clauses in regular for-statements like so:
>[color=green][color=darkred]
> >>> for x in y if x < 10 :[/color][/color]
>
> is semantically equivalent to
>[color=green][color=darkred]
> >>> for x in [x for x in y if x < 10] :[/color][/color]
>
> but is shorter and easier to read. basically, the if works as a filter for
> the values in the iterator. its not a major change, purely syntactic sugar.
> and clearly backwards-compatible.
>
> seem reasonable?[/color]

Seems unnecessary:

for x in y:
if x < 10:
continue

blah blah...


-Peter