Python question: is there a way to write a Python

contextmanager

that can accept some kind of output from the context and do something with it after the

yield

statement?

Hm, I don’t think so. What’s the motivation?

you could use the yielded context object to do this

You could have the context object have a attribute or method to set a value, then use that value

or make the context object callable:

@contextmanager
def record_calls():
    calls = []
    yield lambda *args, **kwds: calls.append((args, kwds))
    for call in calls:
        print(call)

with record_calls() as record:
    for i, c in enumerate('abc'):
        record(**{c: i})

@hundreds-father-404 motivation is that I'd like to turn the paired calls of

_start_run

and

_finish_run

in

local_pants_runner.py

into a context

for a context manager, you'll need to do this via the context object, or i guess you could subclass

BaseException

(kinda cheating but the stdlib does it with

StopIteration

, so who am i to judge)

using a lambda in the

yield

that modifies a data structure in the context seems like a reasonably succinct way to do this, thanks for the suggestion

you could also just do this with a decorator and try/finally

I'm not sure I understand how you might do this with a decorator

i'd probably have to see in context

thanks 🙂

probably not with a contextmanager, but you can with a coroutine