[issue29988] with statements are not ensuring that __exit__ is called if __enter__ succeeds
Nathaniel Smith
report at bugs.python.org
Fri Sep 8 15:10:28 EDT 2017
Nathaniel Smith added the comment:
Here's the patch I mentioned: https://github.com/njsmith/cpython/commit/62547dc5ea323a07c25c2047636a02241f518013
It has a crude but effective technique for handling the hanging issue :-). Alternatively one could use the World's Stupidest Coroutine Runner:
def run(coro):
try:
coro.send(None)
except StopIteration:
pass
else:
raise RuntimeError("yielded")
> I'm also wondering how far we might be able to get by adjusting the pending signal processing such that we always execute at least one line from a function before checking for pending signals
Huh, that's a neat idea. I think it's defeated by 'while True: pass', though :-(. (You have to write it on two lines, but it compiles down to a single instruction that jumps to itself.)
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