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Is the TaskGroup really in the 3.11 release though? It's not to be found anywhere in the Python documentation or release notes: https://docs.python.org/3.11/whatsnew/3.11.html

It has been talked about for a long time, probably 4 years now.

It's implemented in 3.11. Documentation still hasn't been written for it yet though and that's why the issue is still open, https://github.com/python/cpython/issues/90908.