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Thu Nov 16 01:14:20 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-November/150568.html

On Wed, Nov 15, 2017 at 4:27 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> The second way is fairly similar, but instead of replacing the entire
> sys.modules entry, its class is updated to be the class just created --
> something like sys.modules['mymod'].__class__ = MyNewClass .
>
> My request:  Can someone write a better example of the second method?  And
> include __getattr__ ?

Here's a fairly straightforward example:

https://github.com/python-trio/trio/blob/master/trio/_deprecate.py#L114-L140

(Intentionally doesn't include __dir__ because I didn't want
deprecated attributes to show up in tab completion. For other use
cases like lazy imports, you would implement __dir__ too.)

Example usage:

https://github.com/python-trio/trio/blob/master/trio/__init__.py#L66-L98

-n

-- 
Nathaniel J. Smith -- https://vorpus.org

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[Python-Dev] module customization