Import ABC from collections.abc for Python 3.10 compatibility

[kabilar]

Fix #1015. Since there was an issue with the certs in pull request #1002, I have opened this pull request. If there is a better strategy, feel free to close this pull request. Thanks!

[guzman-raphael]

Thanks @kabilar. 👍 Could you just update the changelog/releaselog and the version?

Also, didn't check but would you verify if the collections import is used across all files and apply this there too? I can verify once I am near my machine too.

[guzman-raphael]

Supersedes #1002

[guzman-raphael]

Thanks @kabilar. Just checked and looks like we'll need to update the usage of import collections in the following submodules:

• blob.py
• condition.py
• schemas.py
• settings.py
• table.py

Could you also update the docs-parts/intro/Releases_lang1.rst to reflect your entry in CHANGELOG.md? We need to improve this but currently it is managed in 2 places. 😅

[kabilar]

Thanks @guzman-raphael! Good catch. I have incorporated your suggestions above. I did not update the import in schemas.py since the abc module does not appear to be used there. Please let me know if I am mistaken.

[kabilar]

And in settings.py, I added an additional collections.abc import statement since the defaultdict subclass is used in this submodule.

[CBroz1]

Should we incorporate something like this to retain backwards compatibility?

import collections

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

[dimitri-yatsenko]

@CBroz1 No, we don't need to be compatible to Python 2.7 because we never supported it. The current change is already compatible with all supporting versions of Python 3.*

[guzman-raphael]

Actually, there was some confusion on my part and realized now that defaultdict is actually available at collections top-level. We can actually revert this then. Sorry about that.

[kabilar]

Thanks @guzman-raphael. I have updated this pull request.