> Personally, I'm certainly not ignoring comprehensions. "for thing in
> (x for x in collection if is_interesting(x))" uses comprehensions just
> fine, if you don't like the verbosity of "x for x in", then that's an
> issue with comprehensions, not a reason why comprehensions don't
> address this issue, surely? (Personally, I find the repetitiveness of
> "x for x in" mildly annoying, but not enough to put me off
> comprehensions[1]).


Earlier on the thread, I made a similar point that it would be nice to have
a way to filter without the redundant for x in x. Though I can’t think of a
really good way to express it. But as for filtered for loops:

"for thing in
(x for x in collection if is_interesting(x))"

It not so much the extraneous “x for x” as the duplicated “for thing in”
that bugs me.

I’m curious— to the skeptics: do you think that The above (or a later if
block)  is just as good or better than

for thing in collection if isinteresting(thing):

Or just that it’s not worth it to make a change.

But the other part of why I think comprehensions are relevant is that
introducing anf if to the for statement is not brand new syntax - it would
be allowing existing syntax in a new context that is highly related.

And as for documentation and all that, it’s hard to imagine very many
people not understanding what it means.

Do I care enough to write a PEP? No. So this, like many other small ideas,
will probably die on the vine.

Oh well.

-CHB
-- 
Christopher Barker, PhD (Chris)

Python Language Consulting
  - Teaching
  - Scientific Software Development
  - Desktop GUI and Web Development
  - wxPython, numpy, scipy, Cython
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