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Sun Apr 2 23:47:22 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-April/063312.html

Discovered this while playing around with the 2.5 released end of last
week.

Given:

@contextmanager
def gen():
    print '__enter__'
    yield
    print '__exit__'

with gen():
    raise StopIteration('body')

I would expect to get the StopIteration exception raised. Instead it's
suppressed by the @contextmanager decorator.

I think we should only suppress the exception if it's *not* the
exception passed into gen.throw() i.e. it's raised by the generator.
Does this sound like the correct behaviour? I've attached tests and a
fix implementing this to the bug report.

I can't confirm right now (at work, need to install 2.5) but I'm also
wondering what will happen if KeyboardInterrupt or SystemExit is raised
from inside the generator when it's being closed via __exit__. I suspect
a RuntimeError will be raised, whereas I think these should pass
through.

Tim Delaney

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Showing content from https://mail.python.org/pipermail/python-dev/2006-April/063312.html below:

[Python-Dev] SF #1462485 - StopIteration raised in body of 'with' statement suppressed