I hope this isn't too noobish, nothing on the list comes up in Google, but I'm curious why the construct

for x in y if x.is_some_thing:
  # do a thing

But this is probably clearer (and has the same syntax):

for x in y:
  if x.is_some_thing:
    # do a thing

Cramming two separate thoughts onto a single line is probably *not* clearer.

isn't legal. That seems a very Pythonic symmetry with lambdas. The equivalent syntax required right now is,

for x in [x for x in y if x.is_some_thing]:
  # do a thing

Of course there's more flexibility in the full syntax, but is there any interest in the simpler, more performant one-line syntax?

Em

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