Backports

These packages both exists inside the Standard Library and also outside with another name:

module standard library	external module	package
importlib.metadata	importlib_metadata	python3-importlib-metadata
importlib.resources	importlib_resources	python3-importlib-resources
json	simplejson	python3-simplejson
tomllib	tomli	python3-tomli
unittest.mock	mock	python3-mock
zipfile.Path	zipp.Path	python3-zipp
?BaseExceptionGroup, ?ExceptionGroup	idem	python3-exceptiongroup

In the vast majority of cases, with a recent-enough Python interpreter in Debian, the module from the standard library will be prefered.

python3-toml usage can also trivially be replaced with tomllib

Removed backports

When these backports do not have a single use left in the distribution, they get removed.