Celery broken for python 3.7

[woutdenolf]

The python 3.7 jobs of our CI started failing today. To reproduce the issue, pip install celery in a fresh environment and you get this

python -c "from celery import current_app"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: cannot import name 'current_app' from 'celery' (/users/denolf/virtualenvs/pybox_c5ZgMc/ubuntu_20_04/py37/lib/python3.7/site-packages/celery/__init__.py)

Upon further investigation is seems STATICA_HACK == False despite this

# ...lib/python3.7/site-packages/celery/__init__.py

# This is never executed, but tricks static analyzers (PyDev, PyCharm,
# pylint, etc.) into knowing the types of these symbols, and what
# they contain.
STATICA_HACK = True
globals()['kcah_acitats'[::-1].upper()] = False
breakpoint()
if STATICA_HACK:  # pragma: no cover
    from celery._state import current_app, current_task
    from celery.app import shared_task
    from celery.app.base import Celery
    from celery.app.task import Task
    from celery.app.utils import bugreport
    from celery.canvas import (chain, chord, chunks, group,  # noqa
                               maybe_signature, signature, subtask, xmap,
                               xstarmap)
    from celery.utils import uuid

python --version
Python 3.7.9

pip list
Package            Version
------------------ -------
amqp               5.1.1
billiard           3.6.4.0
cached-property    1.5.2
celery             5.2.7
click              8.1.3
click-didyoumean   0.3.0
click-plugins      1.1.1
click-repl         0.2.0
importlib-metadata 5.0.0
kombu              5.2.4
pip                22.2.2
prompt-toolkit     3.0.31
pytz               2022.4
setuptools         65.4.1
six                1.16.0
typing_extensions  4.3.0
vine               5.0.0
wcwidth            0.2.5
wheel              0.37.1
zipp               3.8.1

I don't see this issue with python 3.8 (and perhaps higher as well, didn't check)

python --version
Python 3.8.5

pip list
Package          Version
---------------- -------
amqp             5.1.1
billiard         3.6.4.0
celery           5.2.7
click            8.1.3
click-didyoumean 0.3.0
click-plugins    1.1.1
click-repl       0.2.0
kombu            5.2.4
pip              22.2.2
prompt-toolkit   3.0.31
pytz             2022.4
setuptools       65.4.1
six              1.16.0
vine             5.0.0
wcwidth          0.2.5
wheel            0.37.1

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[woutdenolf]

Ok it seems related to the latests release of importlib-metadata which is not installed in a python 3.8 environment.

[woutdenolf]

Duplicate of #7783