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

Place this at the top of the script:

import collections

try:
    collectionsAbc = collections.abc
except AttributeError:
    collectionsAbc = collections

Then change all prefixes of the abstract base types, e.g. change collections.abc.MutableMapping or collections.MutableMapping to collectionsAbc.MutableMapping.

Alternatively, import what you require in the script at the top in a single place:

try:
    from collections.abc import Callable  # noqa
except ImportError:
    from collections import Callable  # noqa