New `files()` api from importlib_resources.

[jaraco]

BPO	39791
Nosy	@warsaw, @nascheme, @nascheme, @jaraco, @ned-deily, @ambv, @aixtools, @miss-islington, @hauntsaninja, @benthayer
PRs	bpo-39791: Add files() to importlib.resources #19722 bpo-39791 native hooks for importlib.resources.files #20576 bpo-39791: Refresh importlib.metadata from importlib_metadata 1.6.1. #20656 bpo-39791: Refresh importlib.metadata from importlib_metadata 1.6.1. #20659 [3.9] bpo-39791: Refresh importlib.metadata from importlib_metadata 1.6.1. (GH-20659) #20661 [3.8] bpo-39791: Refresh importlib.metadata from importlib_metadata 1.6.1. (GH-20659) #20662 bpo-39791: Support file systems that cannot support non-ascii filenames. #20681 [3.9] bpo-39791: Support file systems that cannot support non-ascii filenames (skipping tests in that case). (GH-20681) #20695 [3.9] bpo-39791 native hooks for importlib.resources.files (GH-20576) #20703 [3.9] bpo-40924: Revert "bpo-39791 native hooks for importlib.resources.files (GH-20576)" #20760 bpo-41006: importlib.util no longer imports typing #20938 bpo-39791: importlib.abc: avoid use of deprecated abstractproperty #23715 bpo-43288: Fix test_importlib test to correctly skip #24612 bpo-43288: Fix test_importlib test to correctly skip #24612

^{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/jaraco'
closed_at = <Date 2020-12-09.23:47:15.564>
created_at = <Date 2020-02-29.04:11:30.709>
labels = ['type-bug', 'library', '3.9']
title = 'New `files()` api from importlib_resources.'
updated_at = <Date 2021-02-22.00:21:55.488>
user = 'https://github.com/jaraco'

bugs.python.org fields:

activity = <Date 2021-02-22.00:21:55.488>
actor = 'vstinner'
assignee = 'jaraco'
closed = True
closed_date = <Date 2020-12-09.23:47:15.564>
closer = 'jaraco'
components = ['Library (Lib)']
creation = <Date 2020-02-29.04:11:30.709>
creator = 'jaraco'
dependencies = []
files = []
hgrepos = []
issue_num = 39791
keywords = ['patch']
message_count = 17.0
messages = ['362962', '363556', '368484', '368490', '370782', '370790', '370825', '370834', '370840', '370903', '370904', '370945', '370947', '371074', '371131', '371744', '382812']
nosy_count = 9.0
nosy_names = ['barry', 'nascheme', 'nascheme', 'jaraco', 'ned.deily', 'lukasz.langa', 'Michael.Felt', 'miss-islington', 'hauntsaninja', 'benthayer']
pr_nums = ['19722', '20576', '20656', '20659', '20661', '20662', '20681', '20695', '20703', '20760', '20938', '23715', '24612', '24612']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39791'
versions = ['Python 3.9']

[jaraco]

In the importlib_resources backport... in particular in issue 58 and merge request 76, the backport now has a new feature, a "files()" function.

Let's incorporate that functionality into importlib.resources.

[jaraco]

The latest release, 1.3.0, includes extensibility support and has been merged with the cpython branch of the importlib_resources project. I believe that code is now synced with this project and ready to be applied here. I'm hoping benthayer can apply the changes and submit the pr.

[jaraco]

New changeset 7f7e706 by Jason R. Coombs in branch 'master':
bpo-39791: Add files() to importlib.resources (GH-19722)
7f7e706

[jaraco]

I've merged PR 19722. Some follow up actions I'd like to do:

• Add hooks for .files() on built-in loaders.
• Replace loader.get_resource_reader() with adapters around .files() for built-in loaders.

[jaraco]

New changeset 161541a by Jason R. Coombs in branch 'master':
bpo-39791: Refresh importlib.metadata from importlib_metadata 1.6.1. (GH-20659)
161541a

[jaraco]

New changeset a4fa9a9 by Miss Islington (bot) in branch '3.9':
bpo-39791: Refresh importlib.metadata from importlib_metadata 1.6.1. (GH-20659) (GH-20661)
a4fa9a9

[aixtools]

The 'fancy' file name breaks on latin-1 character set.

aixtools@gcc119:[/home/aixtools/python/py39-3.9] a4fa9a95153a3800dea60b3029b2dcaf8a4f6acb Lib/test/test_importlib/test_main.py                   <
diff --git a/Lib/test/test_importlib/test_main.py b/Lib/test/test_importlib/test_main.py
index 42a7999..7b18c3d 100644
--- a/Lib/test/test_importlib/test_main.py
+++ b/Lib/test/test_importlib/test_main.py
@@ -246,3 +246,19 @@ class TestEntryPoints(unittest.TestCase):
         """
         with self.assertRaises(Exception):
             json.dumps(self.ep)
+
+    def test_module(self):
+        assert self.ep.module == 'value'
+
+    def test_attr(self):
+        assert self.ep.attr is None
+
+
+class FileSystem(fixtures.OnSysPath, fixtures.SiteDir, unittest.TestCase):
+    def test_unicode_dir_on_sys_path(self):
+        """
+        Ensure a Unicode subdirectory of a directory on sys.path
+        does not crash.
+        """
+        fixtures.build_files({'☃': {}}, prefix=self.site_dir)
+        list(distributions())

AIX bots fail with:

Captured traceback
==================

Traceback (most recent call last):
  File "/home/shager/cpython-buildarea/3.9.edelsohn-aix-ppc64/build/Lib/test/test_importlib/test_main.py", line 263, in test_unicode_dir_on_sys_path
    fixtures.build_files({'\u2603': {}}, prefix=self.site_dir)
  File "/home/shager/cpython-buildarea/3.9.edelsohn-aix-ppc64/build/Lib/test/test_importlib/fixtures.py", line 202, in build_files
    full_name.mkdir()
  File "/home/shager/cpython-buildarea/3.9.edelsohn-aix-ppc64/build/Lib/pathlib.py", line 1309, in mkdir
    self._accessor.mkdir(self, mode)
UnicodeEncodeError: 'latin-1' codec can't encode character '\u2603' in position 17: ordinal not in range(256)

Test report
===========

Failed tests:

• test_importlib

[jaraco]

Thanks for the report Michael. I'm trying to figure out the best way to address the issue. That test is shared with importlib_metadata, so needs to run without CPython's test suite fixtures, such as the ones that generate non-ascii filenames. I'm tempted to just attempt to create the fixture and skip if the fixture fails. An alternate approach might be to attempt to load CPython's fixture, skip if that value is None, and fallback to the snowman otherwise.

[jaraco]

See #64880 for a proposed fix. I've scheduled the build bots to run the patch. Will build bots prove the fix? If not, can you test the patch in the same environment where it was discovered?

[jaraco]

New changeset 2efe18b by Jason R. Coombs in branch 'master':
bpo-39791: Support file systems that cannot support non-ascii filenames (skipping tests in that case). (bpo-20681)
2efe18b

[miss-islington]

New changeset 71f5016 by Miss Islington (bot) in branch '3.9':
bpo-39791: Support file systems that cannot support non-ascii filenames (skipping tests in that case). (GH-20681)
71f5016