Incorporate changes from importlib_metadata 0.19

[jaraco]

BPO	37697
Nosy	@warsaw, @jaraco
PRs	bpo-37697: Sync with importlib_metadata 0.19 #14993 [3.8] bpo-37697: Sync with importlib_metadata 0.19 (GH-14993) #14995

^{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 2019-07-28.19:46:47.727>
created_at = <Date 2019-07-28.16:14:59.094>
labels = ['3.8', 'library', '3.9']
title = 'Incorporate changes from importlib_metadata 0.19'
updated_at = <Date 2019-07-28.19:46:47.726>
user = 'https://github.com/jaraco'

bugs.python.org fields:

activity = <Date 2019-07-28.19:46:47.726>
actor = 'jaraco'
assignee = 'none'
closed = True
closed_date = <Date 2019-07-28.19:46:47.727>
closer = 'jaraco'
components = ['Library (Lib)']
creation = <Date 2019-07-28.16:14:59.094>
creator = 'jaraco'
dependencies = []
files = []
hgrepos = []
issue_num = 37697
keywords = ['patch']
message_count = 5.0
messages = ['348581', '348582', '348586', '348587', '348588']
nosy_count = 2.0
nosy_names = ['barry', 'jaraco']
pr_nums = ['14993', '14995']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue37697'
versions = ['Python 3.8', 'Python 3.9']

[jaraco]

Importlib_metadata 0.19 is about to release. Let's sync the code with that milestone (https://gitlab.com/python-devs/importlib_metadata/-/milestones/20).

[jaraco]

I've started work on this in jaraco@ee913fd, but two tests are failing:

======================================================================
FAIL: test_egg_info (test.test_importlib.test_main.DirectoryTest)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/jaraco/code/public/cpython/Lib/test/test_importlib/test_main.py", line 172, in test_egg_info
    version('unknown-package')
AssertionError: PackageNotFoundError not raised

======================================================================
FAIL: test_zip_version_does_not_match (test.test_importlib.test_zip.TestEgg)
----------------------------------------------------------------------

Traceback (most recent call last):
  File "/Users/jaraco/code/public/cpython/Lib/test/test_importlib/test_zip.py", line 29, in test_zip_version_does_not_match
    version('definitely-not-installed')
AssertionError: PackageNotFoundError not raised

---

[jaraco]

Okay, I think the issue was that I had failed to make regen-importlib. After doing that, the tests are passing. PR incoming.

[jaraco]

New changeset 049460d by Jason R. Coombs in branch 'master':
bpo-37697: Sync with importlib_metadata 0.19 (bpo-14993)
049460d

[jaraco]

New changeset f96334c by Jason R. Coombs (Miss Islington (bot)) in branch '3.8':
bpo-37697: Sync with importlib_metadata 0.19 (GH-14993) (GH-14995)
f96334c