Nested namespace imports do not work inside zip archives

[AndreyAntsut]

BPO	20899
Nosy	@Yhg1s, @warsaw, @gpshead, @ncoghlan, @ericvsmith, @ericsnowcurrently, @serhiy-storchaka, @jonnyhsu, @iritkatriel
Files	reproduce.zip

^{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:

assignee = None
closed_at = <Date 2021-12-09.00:15:16.850>
created_at = <Date 2014-03-12.20:30:25.235>
labels = ['type-bug']
title = 'Nested namespace imports do not work inside zip archives'
updated_at = <Date 2021-12-09.00:15:16.847>
user = 'https://bugs.python.org/AndreyAntsut'

bugs.python.org fields:

activity = <Date 2021-12-09.00:15:16.847>
actor = 'iritkatriel'
assignee = 'none'
closed = True
closed_date = <Date 2021-12-09.00:15:16.850>
closer = 'iritkatriel'
components = []
creation = <Date 2014-03-12.20:30:25.235>
creator = 'Andrey.Antsut'
dependencies = []
files = ['34380']
hgrepos = []
issue_num = 20899
keywords = []
message_count = 3.0
messages = ['213290', '364937', '408056']
nosy_count = 10.0
nosy_names = ['twouters', 'barry', 'gregory.p.smith', 'ncoghlan', 'eric.smith', 'eric.snow', 'serhiy.storchaka', 'Andrey.Antsut', 'Jonathan Hsu', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue20899'
versions = ['Python 3.4', 'Python 3.5']

[AndreyAntsut]

Importing modules from subdirectories as "implicit namespace packages" (PEP-420) inside a ZIP archive only works one level deep. Imports from within nested namespaces fail with "ImportError: No module named 'XXX'".

I am attaching an archive with example directory/file structure. To reproduce the problem, run the following from where you unzipped it:

python
>>> import sys
>>> sys.path += ['project1', 'project2.zip', 'project3', 'project4.zip']
>>> import parent.child.hello1
Hello 1
>>> import parent.child.hello2
ImportError: No module named 'parent.child.hello2'
>>> import parent.child.hello3
Hello 3
>>> import parent.child.hello4
ImportError: No module named 'parent.child.hello4'
>>> import boo
boo!
>>> import parent.boo
boo!

Tested on WinXP SP3 with Python 3.3.5 and 3.4.0rc3.

[jonnyhsu]

It appears this issue has been fixed, as I am unable to reproduce it on Windows 10/Python 3.7:

Python 3.7.7 (tags/v3.7.7:d7c567b08f, Mar 10 2020, 10:41:24) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path += ['project1', 'project2.zip', 'project3', 'project4.zip']
>>> import parent.child.hello1
Hello 1
>>> import parent.child.hello2
Hello 2
>>> import parent.child.hello3
Hello 3
>>> import parent.child.hello4
Hello 4
>>> import boo
boo!
>>> import parent.boo
boo!

[iritkatriel]

I got the same results as Jonathan.