Improve performance of importlib.metadata and zipfile.Path

[jaraco]

BPO	39595
Nosy	@jaraco
PRs	bpo-39595: Improve zipfile.Path performance #18406 [3.8] bpo-39595: Improve zipfile.Path performance (GH-18406) #18472

^{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 2020-02-12.03:22:02.470>
created_at = <Date 2020-02-09.21:01:21.929>
labels = ['3.8', '3.9']
title = 'Improve performance of importlib.metadata and zipfile.Path'
updated_at = <Date 2020-02-12.03:22:02.469>
user = 'https://github.com/jaraco'

bugs.python.org fields:

activity = <Date 2020-02-12.03:22:02.469>
actor = 'jaraco'
assignee = 'jaraco'
closed = True
closed_date = <Date 2020-02-12.03:22:02.470>
closer = 'jaraco'
components = []
creation = <Date 2020-02-09.21:01:21.929>
creator = 'jaraco'
dependencies = []
files = []
hgrepos = []
issue_num = 39595
keywords = ['patch']
message_count = 3.0
messages = ['361663', '361861', '361862']
nosy_count = 1.0
nosy_names = ['jaraco']
pr_nums = ['18406', '18472']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39595'
versions = ['Python 3.8', 'Python 3.9']

[jaraco]

As reported in jaraco/zipp#32, performance of zipfile.Path is inadequate. This bug tracks the incorporation of those improvements as well as those in importlib_metadata 1.5.

[jaraco]

New changeset e5bd736 by Jason R. Coombs in branch 'master':
bpo-39595: Improve zipfile.Path performance (bpo-18406)
e5bd736

[jaraco]

New changeset ed4d263 by Miss Islington (bot) in branch '3.8':
bpo-39595: Improve zipfile.Path performance (GH-18406) (GH-18472)
ed4d263