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pkgutil.extend_path fails with zipped eggs if not at first place #82834

Open a9f0f04e-d35d-4bb1-aab8-c9205db013c8 opened 4 years ago

a9f0f04e-d35d-4bb1-aab8-c9205db013c8 commented 4 years ago
BPO 38653

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields: ```python assignee = None closed_at = None created_at = labels = ['3.7', 'type-bug', 'library'] title = 'pkgutil.extend_path fails with zipped eggs if not at first place' updated_at = user = 'https://bugs.python.org/htgoebel' ``` bugs.python.org fields: ```python activity = actor = 'lkollar' assignee = 'none' closed = False closed_date = None closer = None components = ['Library (Lib)'] creation = creator = 'htgoebel' dependencies = [] files = [] hgrepos = [] issue_num = 38653 keywords = [] message_count = 1.0 messages = ['355745'] nosy_count = 2.0 nosy_names = ['htgoebel', 'lkollar'] pr_nums = [] priority = 'normal' resolution = None stage = None status = 'open' superseder = None type = 'behavior' url = 'https://bugs.python.org/issue38653' versions = ['Python 2.7', 'Python 3.7'] ```

a9f0f04e-d35d-4bb1-aab8-c9205db013c8 commented 4 years ago

I have a test site containing nested namespace packages in zipped and unzipped eggs_

When using order "aaa, bbb, ccc" in PYTHONPATH, importing "nspkg3.bbb" FAILS, whereas when using order "bbb, aaa, ccc" in PYTHONPATH, importing "nspkg3.bbb" PASSES,

I would expect "nspk3.bbb" to ba importable 8as a namespace package) no matter which possition it has in PYTHONPATH.

How to reproduce

Preperation: get hands on the eggs in question:

$ wget https://github.com/pyinstaller/pyinstaller/archive/v3.5.zip
$ unzip v3.5.zip
$ cd pyinstaller-3.5/tests/functional/modules/nspkg3-pkg/

Order "aaa, bbb, ccc": fails

$ PYTHONPATH=nspkg3_aaa.egg:nspkg3_bbb.egg:nspkg3_ccc.egg python3.7 -c "import nspkg3.bbb.zzz"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'nspkg3.bbb'

Order "bbb, aaa, ccc": passes:

$ PYTHONPATH=nspkg3_bbb.egg:nspkg3_aaa.egg:nspkg3_ccc.egg python3.7 -c "import nspkg3.bbb.zzz"
this is module nspkg3.bbb.zzz

Further information

I did some research and found that the zipped egg (bbb) is *not added* to the package path when using order "aaa, bbb, ccc":

Order "aaa, bbb, ccc": bbb is missing here

$ PYTHONPATH=nspkg3_aaa.egg:nspkg3_bbb.egg:nspkg3_ccc.egg \
   python3.7 -c "import nspkg3 ; print(nspkg3.__path__)"
['…/nspkg3_aaa.egg/nspkg3', '…/nspkg3_ccc.egg/nspkg3']

Order "bbb, aaa, ccc": bbb is included

$ PYTHONPATH=nspkg3_bbb.egg:nspkg3_aaa.egg:nspkg3_ccc.egg \
   python3.7 -c "import nspkg3 ; print(nspkg3.__path__)"
['…/nspkg3_bbb.egg/nspkg3', '…/nspkg3_aaa.egg/nspkg3', '…/nspkg3_ccc.egg/nspkg3']

Also tested with Python 2.7: Same results