[issue46546] `importlib.metadata.DeprecatedList` leaks `method_name` variable

[Jason R. Coombs]

Jason R. Coombs <jaraco at jaraco.com> added the comment:

Thanks Nikita for the report. I agree, it's inelegant that this property leaks. Because this code is synced with importlib_metadata, I'm not sure it's worth the effort of changing it here. Your change here implies a cherry-pick to the backport and updating its changelog there too.

I'd be more inclined to accept a change like this on importlib_metadata, which has a faster iteration and whose changes get naturally incorporated into CPython periodically.

What's the harm in leaving this attribute on a class that is itself standing in for deprecated behavior and slated for removal?

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<https://bugs.python.org/issue46546>
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