Fix deprecation of importing directly abc from collections #1168
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DeprecationWarning: Using or importing the ABCs from 'collections' instead
of from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop working
Solution found there:
https://stackoverflow.com/questions/53978542/how-to-use-collections-abc-from-both-python-3-8-and-python-2-7