Bump to Python 3.8

Closes #573 (closed), closes #899 (closed)

This will require a base image build (git tag base-python-3.8) to work.

It seems #573 (closed) was caused by some changes in Python's implementation of list(…) and collections.abc.Sequence.__getitem__, which causes multiple calls to BulkMap.__len__ to be made. I could not understand a single thing from CPython's git repo, so I just chose to cache the queryset's length as an attribute of the BulkMap.

assigned to @erwanrouchet

requested review from @babadie

changed the description

To merge after 1.1.3

resolved all threads

added 1 commit

• 9d522c8c - Remove pre-commit default language version

Compare with previous version

added 14 commits

• 9d522c8c...f1e2f6a5 - 12 commits from branch master
• d90e1a8d - Bump to Python 3.8
• a90c2d19 - Remove pre-commit default language version

Compare with previous version

I just tested a local build of all 3 images (base + normal + binary) and ran both high level images locally without issues.

Build for new base : https://gitlab.com/arkindex/backend/-/pipelines/416146362

mentioned in commit d1399488

merged