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

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?