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https://issues.apache.org/jira/browse/PYLUCENE-51?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16953272#comment-16953272
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Andreas Vajda commented on PYLUCENE-51:
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I added the setting of type._ _ module_ _  in installType() (python 3 only).
This should fix the bug, please verify that the issue with doctest is resolved.
In python 3:

    >>> from lucene import initVM
    >>> initVM()
    <jcc.JCCEnv object at 0x100bec498>
    >>> from org.apache.lucene.document import Document
    >>> Document.__module__
    'org.apache.lucene.document'
     >>>


> "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
>            Priority: Major
>
> 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:
> {noformat}
> [...]/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_{noformat}
>  
> In doctest 
> ([https://github.com/python/cpython/blob/master/Lib/doctest.py#L959]), the
> {code:java}
> inspect.isclass(object) {code}
> 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):
> {noformat}
> [...]/lib/python3.7/importlib/bootstrap.py:219: DeprecationWarning: builtin 
> type ExtendedKalmanFilter has no __module_ attribute
>  return f(*args, **kwds){noformat}
> 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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