Python: Migrate to use "implicit namespace packages" (PEP 420). Dependencies: Use crate>=1.0.0.dev2 for validation purposes. CI: Use Python 3.11, up from 3.8.

[amotl]

About

This change is part of the modernization process to migrate to modern Python namespace packages according to PEP 420. In order to continue supporting code that has been slotted into crate.qa, a little update was also needed here.

Problem

ModuleNotFoundError: No module named 'crate.client'

References

• Python: Migrate to use "implicit namespace packages" (PEP 420) crate-python#666
• Python: Migrate to use "implicit namespace packages" (PEP 420) crash#448

/cc @surister, @simonprickett, @kneth

[amotl]

Problem

Happens on Python 3.8. Does not happen on Python 3.9.

ImportError: Failed to import test module: test_cli
Traceback (most recent call last):
  File "/usr/lib/python3.8/unittest/loader.py", line 436, in _find_test_path
    module = self._get_module_from_name(name)
  File "/usr/lib/python3.8/unittest/loader.py", line 377, in _get_module_from_name
    __import__(name)
  File "/var/lib/jenkins/workspace/CrateDB/qa/crate_qa_on_pr/tests/startup/test_cli.py", line 6, in <module>
    from crate.qa.tests import NodeProvider
ModuleNotFoundError: No module named 'crate.qa'

Solution

671dc3a adds an update to use Python 3.11 on CI.