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Lazily import parallelized format modules
authorRichard Si <63936253+ichard26@users.noreply.github.com>
Thu, 4 Aug 2022 00:18:33 +0000 (20:18 -0400)
committerRichard Si <63936253+ichard26@users.noreply.github.com>
Sat, 27 Aug 2022 01:11:00 +0000 (21:11 -0400)
`black.reformat_many` depends on a lot of slow-to-import modules. When
formatting simply a single file, the time paid to import those modules
is totally wasted. So I moved `black.reformat_many` and its helpers
to `black.concurrency` which is now *only* imported if there's more
than one file to reformat. This way, running Black over a single file
is snappier

Here are the numbers before and after this patch running `python -m
black --version`:

- interpreted: 411 ms +- 9 ms -> 342 ms +- 7 ms: 1.20x faster
- compiled: 365 ms +- 15 ms -> 304 ms +- 7 ms: 1.20x faster

Co-authored-by: Fabio Zadrozny <fabiofz@gmail.com>

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