On Tue, 29 Dec 2020, Terry Reedy wrote:
Packages have to be installed for a particular Python binary in order for that binary to import the package.
Terry, I forgot about this as I don't often upgrade Python.
Those packages apparently are not installed for that 3.9.1 binary.
This will be corrected today. Thanks. Stay well, Rich -- https://mail.python.org/mailman/listinfo/python-list