[Python-Dev] module customization (original) (raw)

Guido van Rossum guido at python.org
Wed Nov 15 20:49:07 EST 2017

On Wed, Nov 15, 2017 at 4:27 PM, Ethan Furman <ethan at stoneleaf.us> wrote:

So there are currently two ways to customize a module, with PEP 562 proposing a third.

The first method involves creating a standard class object, instantiating it, and replacing the sys.modules entry with it. 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 ? My question: Does that getattr method have 'self' as the first parameter?

It does.

If not, why not, and if so, shouldn't PEP 562's getattr also take a 'self'?

Not really, since there's only one module (the one containing the getattr function). Plus we already have a 1-argument module-level getattr in mypy. See PEP 484.

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