Namespace packages have inconsistent __loader__ and __spec__.loader

[warsaw]

BPO	32303
Nosy	@warsaw, @ericvsmith
PRs	bpo-32303: Consistency fixes for namespace loaders #5481 [3.7] bpo-32303 - Consistency fixes for namespace loaders (GH-5481) #5498 [3.6] bpo-32303 - Consistency fixes for namespace loaders (GH-5481) #5504 bpo-32872 - Revert "[3.6] bpo-32303 - Consistency fixes for namespace loaders... #5911

^{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 = 'https://github.com/warsaw'
closed_at = <Date 2018-02-03.04:21:37.059>
created_at = <Date 2017-12-13.15:41:43.123>
labels = ['3.7', '3.8']
title = 'Namespace packages have inconsistent __loader__ and __spec__.loader'
updated_at = <Date 2018-02-26.19:23:32.471>
user = 'https://github.com/warsaw'

bugs.python.org fields:

activity = <Date 2018-02-26.19:23:32.471>
actor = 'barry'
assignee = 'barry'
closed = True
closed_date = <Date 2018-02-03.04:21:37.059>
closer = 'barry'
components = []
creation = <Date 2017-12-13.15:41:43.123>
creator = 'barry'
dependencies = []
files = []
hgrepos = []
issue_num = 32303
keywords = ['patch']
message_count = 6.0
messages = ['308204', '311464', '311511', '311529', '311532', '312945']
nosy_count = 2.0
nosy_names = ['barry', 'eric.smith']
pr_nums = ['5481', '5498', '5504', '5911']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue32303'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[warsaw]

Let's say I have a namespace package:

>>> importlib_resources.tests.data03.namespace
<module 'importlib_resources.tests.data03.namespace' (namespace)>

This package has a non-None __loader__ but a None __spec__.loader:

>>> importlib_resources.tests.data03.namespace.__loader__
<_frozen_importlib_external._NamespaceLoader object at 0x1043c1588>
>>> importlib_resources.tests.data03.namespace.__spec__.loader
>>> 

That seems inconsistent and broken. I suspect it's just an oversight that the __spec__.loader for a namespace package isn't getting set. It's probably been this way forever.

See also bpo-31554

[warsaw]

3.5 is in security fix only mode, and this is not a security issue.

[warsaw]

New changeset bbbcf86 by Barry Warsaw in branch 'master':
bpo-32303 - Consistency fixes for namespace loaders (bpo-5481)
bbbcf86

[warsaw]

New changeset a23d30f by Barry Warsaw in branch '3.7':
bpo-32303 - Consistency fixes for namespace loaders (GH-5481) (bpo-5503)
a23d30f

[warsaw]

New changeset a71397f by Barry Warsaw in branch '3.6':
[3.6] bpo-32303 - Consistency fixes for namespace loaders (GH-5481) (bpo-5504)
a71397f

[warsaw]

New changeset 86ea851 by Barry Warsaw in branch '3.6':
Revert "[3.6] bpo-32303 - Consistency fixes for namespace loaders (GH-5481) (bpo-5504)" (bpo-5911)
86ea851