Remove unused imports in the stdlib (April 2020 edition)

[vstinner]

BPO	40443
Nosy	@terryjreedy, @vstinner, @corona10, @miss-islington
PRs	bpo-40443: Remove unused imports in idlelib #19801 bpo-40443: Remove unused imports in distutils #19802 bpo-40443: Remove unused imports in the stdlib #19803 bpo-40443: Remove unused imports from tests #19804 bpo-40443: Remove unused imports from tests #19805 [3.7] bpo-40443: Remove unused imports in idlelib (GH-19801) #19808 [3.8] bpo-40443: Remove unused imports in idlelib (GH-19801) #19809 bpo-40443: Remove unused imports in stdlib #19815 bpo-40443: Remove unused imports in the zoneinfo #20354 [3.9] bpo-40443: Remove unused imports in the zoneinfo (GH-20354) #20359 bpo-40443: Remove unused imports #25429

^{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 2020-05-01.00:38:25.016>
created_at = <Date 2020-04-29.22:42:28.273>
labels = ['tests', 'library', '3.9']
title = 'Remove unused imports in the stdlib (April 2020 edition)'
updated_at = <Date 2021-04-16.09:26:36.672>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2021-04-16.09:26:36.672>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2020-05-01.00:38:25.016>
closer = 'vstinner'
components = ['Library (Lib)', 'Tests']
creation = <Date 2020-04-29.22:42:28.273>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 40443
keywords = ['patch']
message_count = 13.0
messages = ['367711', '367715', '367720', '367725', '367727', '367728', '367748', '367749', '367819', '367820', '369805', '369807', '391174']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'vstinner', 'corona10', 'miss-islington']
pr_nums = ['19801', '19802', '19803', '19804', '19805', '19808', '19809', '19815', '20354', '20359', '25429']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue40443'
versions = ['Python 3.9']

[vstinner]

Attached PRs removed unused imports from the Python standard library.

I used pyflakes and looked for "imported but unused" warnings. I ignored tons of warnings, since many are false alarms: imports done on purpose.

Previous editions:

• 2014: bpo-20976
• 2017: bpo-29919

[vstinner]

New changeset 57572b1 by Victor Stinner in branch 'master':
bpo-40443: Remove unused imports in tests (GH-19805)
57572b1

[vstinner]

New changeset b1e11c3 by Victor Stinner in branch 'master':
bpo-40443: Remove unused imports in tests (GH-19804)
b1e11c3

[terryjreedy]

New changeset 6900f16 by Victor Stinner in branch 'master':
bpo-40443: Remove unused imports in idlelib (GH-19801)
6900f16

[miss-islington]

New changeset 48ef06b by Miss Islington (bot) in branch '3.7':
bpo-40443: Remove unused imports in idlelib (GH-19801)
48ef06b

[miss-islington]

New changeset 95e208d by Miss Islington (bot) in branch '3.8':
bpo-40443: Remove unused imports in idlelib (GH-19801)
95e208d

[vstinner]

New changeset 9054967 by Victor Stinner in branch 'master':
bpo-40443: Remove unused imports in the stdlib (GH-19803)
9054967

[vstinner]

New changeset e488e30 by Victor Stinner in branch 'master':
bpo-40443: Remove unused imports in distutils (GH-19802)
e488e30

[vstinner]

New changeset eb0d359 by Victor Stinner in branch 'master':
bpo-40443: Remove unused imports in stdlib (GH-19815)
eb0d359