Not sure if this belongs on distutils-sig or import-sig, but I'm experiencing slightly odd behavior with wheels and namespace packages.
Fetch a namespace package source distribution, e.g. twitter.common.python, and build two copies of it, one with bdist_egg and one with bdist_wheel. This leaves me with: twitter.common.python-0.3.1-py2.6.egg twitter.common.python-0.3.1-py26-none-any.whl Explode them into the following directories (respectively): egg_dist whl_dist Then attempt: PYTHONPATH=egg_dist python -c 'import twitter.common.python' (works) PYTHONPATH=whl_dist python -c 'import twitter.common.python' (drumroll) Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: No module named twitter.common.python This is slightly unexpected. Absent from the .whl distribution are the __init__.pys with the proper declare_namespace declarations. Even more bizarrely: PYTHONPATH=whl_dist python -c 'import pkg_resources' Traceback (most recent call last): File "<string>", line 1, in <module> File "/Users/wickman/Python/CPython-2.6.9/lib/python2.6/site-packages/pkg_resources.py", line 2736, in <module> add_activation_listener(lambda dist: dist.activate()) File "/Users/wickman/Python/CPython-2.6.9/lib/python2.6/site-packages/pkg_resources.py", line 698, in subscribe callback(dist) File "/Users/wickman/Python/CPython-2.6.9/lib/python2.6/site-packages/pkg_resources.py", line 2736, in <lambda> add_activation_listener(lambda dist: dist.activate()) File "/Users/wickman/Python/CPython-2.6.9/lib/python2.6/site-packages/pkg_resources.py", line 2274, in activate list(map(declare_namespace, self._get_metadata('namespace_packages.txt'))) File "/Users/wickman/Python/CPython-2.6.9/lib/python2.6/site-packages/pkg_resources.py", line 1870, in declare_namespace path = sys.modules[parent].__path__ KeyError: 'twitter' So even pkg_resources is surprised as well. If I do the following: PYTHONPATH=whl_dist python -c 'import site; site.addsitedir("whl_dist"); import twitter.common.python' then it works, since the twitter.common.python-0.3.1-py2.6-nspkg.pth gets processed properly and module.__path__s populated accordingly. I would expect pkg_resources to handle this fine but apparently it doesn't. Any ideas? Bug in pkg_resources, wheel or PEBKAC? Thanks! ~brian
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