Python 3.10 removing the aliases to the ABCs from the collections module

[garybuhrmaster]

One of the changes in python 3.10 is the removal of the long deprecated aliases to the Abstract Base Classes from the collections module: https://docs.python.org/3.10/whatsnew/3.10.html#removed

Code of the form:

  from collections import Sequence

will need to be changed to something like:

  try:
    from collections.abc import Sequence
  except ImportError:
    from collections import Sequence

There are a couple of such changes that will need to occur in the MythTV python codes.

Python 3.10 is expected to be released in early October 2021, and the betas are already available in some (b)leading edge distros.

A pull request will be created shortly