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From Clément Jonglez (Jira) <j...@apache.org>
Subject [jira] [Created] (PYLUCENE-51) "AttributeError: __module__" when running doctest
Date Thu, 10 Oct 2019 23:21:00 GMT
Clément Jonglez created PYLUCENE-51:
---------------------------------------

             Summary: "AttributeError: __module__" when running doctest
                 Key: PYLUCENE-51
                 URL: https://issues.apache.org/jira/browse/PYLUCENE-51
             Project: PyLucene
          Issue Type: Bug
         Environment: Ubuntu 19.04, Python 3.7
            Reporter: Clément Jonglez


Dear all,

I am using the Orekit Python wrapper by [~petrush] . I am running into errors & warnings
when trying to run tests with doctest. When collecting tests, it analyzes the classes (all
the 1000+ wrapped Java classes it seems) and runs into the following error:
```
[...]/lib/python3.7/site-packages/pytest_doctestplus/plugin.py:137: in collect
 for test in finder.find(module):
[...]/lib/python3.7/site-packages/pytest_doctestplus/plugin.py:425: in find
 extraglobs)
[...]/lib/python3.7/doctest.py:932: in find
 self._find(tests, obj, name, module, source_lines, globs, {})
[...]/lib/python3.7/doctest.py:993: in _find
 self._from_module(module, val)):
[...]/lib/python3.7/doctest.py:960: in _from_module
 return module.__name__ == object.__module__
E AttributeError: __module__
```

In doctest (https://github.com/python/cpython/blob/master/Lib/doctest.py#L959), the `inspect.isclass(object)`
condition at line 959 returns `True`, and therefore doctest tries to access the object's `__module__`
attribute, which does not seem to exist.

Besides, pytest prints a warning for each Java class being wrapped, also because they have
no __module__ attribute (this is one example of 1000+ warnings):
```
[...]/lib/python3.7/importlib/_bootstrap.py:219: DeprecationWarning: builtin type ExtendedKalmanFilter
has no __module__ attribute
 return f(*args, **kwds)
```

This phenomenon is new because 6 months ago I could run pytest & doctest successfully
with Orekit. I could not find which module contains the change that broke stuff since then
though.

To reproduce the phenomenon, you can check out https://github.com/GorgiAstro/poliastro/blob/orekit-validation/src/poliastro/tests/tests_twobody/test_propagation.py#L164
I was trying to validate some poliastro features using the Orekit python wrapper. So this
code requires poliastro, it is available on conda-forge.

Cheers

Clément



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