How to use collections.abc from both Python 3.8+ and Python 2.7

Question

In Python 3.3 \"abstract base classes\" in collections (like MutableMapping or MutableSequence) were moved to second-level module

Answer 1

I was getting error like this:

C:\Users\gsc-30431\Anaconda3\lib\site-packages\unittest2\compatibility.py:148
  C:\Users\gsc-30431\Anaconda3\lib\site-packages\unittest2\compatibility.py:148: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is depr
ecated since Python 3.3,and in 3.9 it will stop working
    class ChainMap(collections.MutableMapping):

-- Docs: https://docs.pytest.org/en/latest/warnings.html

SO i opened the File Compatibility.py by visiting the path showing in the error above! and Searched there the code where this Collections package is being used and Changed the previous line i.e:

class ChainMap(collections.MutableMapping):

to new Line:

class ChainMap(collections.abc.MutableMapping):

Screenshot:

Just by adding .abc has solved my problem and i'm not getting warning anymore!