Use f-strings instead of str.format within importlib

[gpshead]

BPO	38693
Nosy	@gpshead, @jaraco, @ericvsmith, @serhiy-storchaka, @csabella, @miss-islington, @tirkarthi, @FFY00
PRs	bpo-38693: Use f-strings instead of str.format() within importlib #17058 bpo-38693: importlib.metadata f-strings #26383 [3.10] bpo-38693: importlib.metadata f-strings (GH-26383) #26386 bpo-38693: Prefer f-strings in importlib.resources (importlib_resources 5.0.6). #26387 [3.10] bpo-38693: Prefer f-strings in importlib.resources (importlib_resources 5.0.6). (GH-26387) #26389

^{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/gpshead'
closed_at = None
created_at = <Date 2019-11-05.06:20:17.309>
labels = ['3.11', 'performance']
title = 'Use f-strings instead of str.format within importlib'
updated_at = <Date 2021-05-26.21:09:35.360>
user = 'https://github.com/gpshead'

bugs.python.org fields:

activity = <Date 2021-05-26.21:09:35.360>
actor = 'jaraco'
assignee = 'gregory.p.smith'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2019-11-05.06:20:17.309>
creator = 'gregory.p.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 38693
keywords = ['patch']
message_count = 9.0
messages = ['356005', '369672', '378998', '393617', '393629', '394453', '394454', '394460', '394463']
nosy_count = 8.0
nosy_names = ['gregory.p.smith', 'jaraco', 'eric.smith', 'serhiy.storchaka', 'cheryl.sabella', 'miss-islington', 'xtreak', 'FFY00']
pr_nums = ['17058', '26383', '26386', '26387', '26389']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue38693'
versions = ['Python 3.11']

[gpshead]

importlib is full of str.format calls, modernizing it to use f-strings is a slight performance win and much more readable.

[csabella]

Did you want this one to land in 3.9?

[gpshead]

Status: Waiting until after the importlib.metadata and importlib.resources backports drop support for both Python 2.7 and 3.5 as keeping them in sync would be a pain for maintainers (per jaraco on our sprint importlib-any chat today)

[FFY00]

Both importlib_metadata and importlib_resources have dropped support for Python 2.7 and 3.5, this should now be unblocked.

[serhiy-storchaka]

I just have merged a change which makes many C-style formatting as fast as f-strings (bpo-28307) and am working on supporting more format codes (%d, %x, %f, etc). Using C-style formatting can be a good option if you want performance and backward compatibility. It was faster than str.format() even without that optimization.

[miss-islington]

New changeset e6c815d by Jason R. Coombs in branch 'main':
bpo-38693: importlib.metadata f-strings (GH-26383)
e6c815d