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POFailure to find module in split namespace
 

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    <p>I am working with <code>Python 3.3.1</code> 64 bit on <code>Ubuntu 13.04</code> 64 bit running under <code>Eclipse 4.3</code> 64 bit with <code>Pydev 2.7.6</code> in a <code>virtualenv</code> environment. I have my project in the following directory structure.</p> <pre><code>Dictionary | ---------------------------- | | src test | | petaapan petaapan | | | | __init__.py logging __init__.py logging | | | | __init__.py mplogging.py __init__.py test_mplogging.py </code></pre> <p>When I try to run <code>test_mplogging.py</code> using <code>pytest</code> as the test runner I get the following results:</p> <pre><code>pydev debugger: starting ============================= test session starts ============================== platform linux -- Python 3.3.1 -- pytest-2.3.5 plugins: pep8, cache collected 0 items / 1 errors ==================================== ERRORS ==================================== ______________________ ERROR collecting test_mplogging.py ______________________ File "/home/jonathan/UC/Git Repositories/isiiwesuu/Dictionary/tests/petaapan/logging/test_mplogging.py", line 11 in &lt;module&gt; &gt; import petaapan.logging.mplogging as ml E ImportError: No module named 'petaapan.logging.mplogging' </code></pre> <p>My <code>sys.path</code> has <code>Dictionary/test</code> ahead of <code>Dictionary/src</code> so the test tree is searched first and it looks as though that is why the import failed with regular packages.</p> <p>My next attempt was to do the same using namespace packages, so I removed all the <code>__init__.py</code> files and got the following results:</p> <pre><code>pydev debugger: starting ============================= test session starts ============================== platform linux -- Python 3.3.1 -- pytest-2.3.5 plugins: pep8, cache collected 0 items / 1 errors ==================================== ERRORS ==================================== ______________________ ERROR collecting test_mplogging.py ______________________ File "/home/jonathan/UC/Git Repositories/isiiwesuu/Dictionary/tests/petaapan/logging/test_mplogging.py", line 11 in &lt;module&gt; &gt; import petaapan.logging.mplogging as ml File "/home/jonathan/UC/Git Repositories/isiiwesuu/Dictionary/tests/petaapan/logging/&lt;frozen importlib._bootstrap&gt;", line 1564 in _find_and_load &gt; ??? File "/home/jonathan/UC/Git Repositories/isiiwesuu/Dictionary/tests/petaapan/logging/&lt;frozen importlib._bootstrap&gt;", line 1522 in _find_and_load_unlocked &gt; ??? File "/home/jonathan/UC/Git Repositories/isiiwesuu/Dictionary/tests/petaapan/logging/&lt;frozen importlib._bootstrap&gt;", line 1476 in _find_module &gt; ??? File "/home/jonathan/isiiwesuu/lib/python3.3/site-packages/_pytest/assertion/rewrite.py", line 68 in find_module &gt; fd, fn, desc = imp.find_module(lastname, path) File "/home/jonathan/isiiwesuu/lib/python3.3/imp.py", line 197 in find_module &gt; "not {}".format(type(name))) E RuntimeError: 'list' must be None or a list, not &lt;class 'str'&gt; =========================== 1 error in 0.49 seconds ============================ </code></pre> <p>Here is <code>test_mplogging.py</code> relevant parts:</p> <pre><code>import logging from os import getcwd from multiprocessing import Queue, Process import petaapan.logging.mplogging as ml </code></pre> <p>Can anyone suggest what I need to do in this situation?</p>
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    1. COI have been investigating this problem further. It is beginning to look like there is a potential problem in `pytest` with split namespaces, The support for PEP420 introduced a new internal class `_NamespacePath` and `pytest` hooks the import machinery to allow it to rewrite asssertions. The problem is that the `pytest rewrite` module does not understand this new class and eventually causes the import to fail. I am investigating further and will report my findings in an Answer.
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    2. COI am hoping that someone from the `pytest` dev team will comment on this so I can take it further.
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