PyO3 error

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Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
35/100
Tipo di issue
Bug
Chiarezza
Da chiarire
Stato di attività
Ferma
Stack tecnologico
python
Ambito
testing-qa

Direzione di ricerca

Reproduce the failure with test_one.py, folder/init.py, folder/some_module.py, and the stated pytest command and package versions. Start by investigating how the --cov=folder.some_module entry point affects imports, then compare runs with and without --cov and with the listed dependency versions. Done means the cause is established and the reproducer no longer fails or the limitation is documented.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

Hello,

I am currently debugging weird issue that happens to us only when using --cov arguments to pytest and only during running tests (not in production with the same code).

Reproducer

I was able to narrow it down for this little setup:
create this structure:

.
├── folder
│   ├── __init__.py
│   └── some_module.py
└── test_one.py

Now, some_module.py is empty.
folder/__init__.py has this content:

`from cryptography.hazmat.primitives import hashes`

test_one.py has this content:

`from cryptography.hazmat.primitives import hashes`

When you run this command (note that in my case the whole directory structure is in /home/vagrant/neto directory):

`PYTHONPATH=$PYTHONPATH:/home/vagrant/neto pytest /home/vagrant/neto/test_one.py --cov=folder.some_module`

you get

ImportError while importing test module '/home/vagrant/neto/test_one.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
../.pyenv/versions/3.8.18/lib/python3.8/importlib/__init__.py:127: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
test_one.py:2: in <module>
    from cryptography.hazmat.primitives import hashes
../venv/pack/lib/python3.8/site-packages/cryptography/hazmat/primitives/hashes.py:10: in <module>
    from cryptography.hazmat.bindings._rust import openssl as rust_openssl
E   ImportError: PyO3 modules may only be initialized once per interpreter process

explanation

Reasons why I think (though not sure) the problem is in python-cov:

  • you can switch from cryptography.hazmat.primitives import hashes for import jsonschema and you get the into the same error.
  • we dont get any errors in production with the other imported packages.
  • you remove the --cov attribute and it runs without errors.
  • that importError sounds like that it might be caused by the way --cov path is handled internally?

versions

  • python 3.8.18
  • pytest 7.4.2
  • pytest-cov 4.1.0
  • jsonschema 4.19.1, problem doesnt appear when downgrading to 4.17.3
  • cryptography 41.0.4, problem doesnt appear when downgrading to 40.0.2
Lingua principale
Python
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