Change to use not-deprecated ABC

fiaas / mast

Apache License 2.0

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Change to use not-deprecated ABC #18

Closed gregjones closed 4 years ago

gregjones commented 5 years ago

Fixes: "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"