[issue42280] The list of standard generic collections is incomplete

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I think the difference between the two lists is that not every generic type is a collection.

If we apply that standard, I think the contextlib and re classes need to be *removed* from the list (did I get that right?).

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<https://bugs.python.org/issue42280>
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