With class as contextmanager
ethan at stoneleaf.us
Tue Jan 24 17:35:08 EST 2017
On 01/24/2017 01:31 PM, This Wiederkehr wrote:
> having a class definition:
> class Test():
> def __enter__(cls):
> def __exit__(cls, exception_type, execption_value, callback):
> now using this as a contextmanager does not work, even though Test is an
> object and has the two required methods __enter__ and __exit__.
It is not working because you are trying to use the class itself, and not it's instances, as a context manager (which also means you don't need classmethod):
> I am asking because I'd like to implement the clean up behaviour for
> multiple instances directly into the class:
> with Test:
> testinstance1 = Test()
> testinstance2 = Test()
> # on context exit Test.__exit__ should take care on cleaning up
> testinstance1 and testinstance2.
You might be able to make this work with a custom type (aka using a custom metaclass) -- but that could be a bunch of work.
More information about the Python-list