bpo-43392: Optimize repeated calls to __import__() (GH-24735)

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Implements a two steps check in `importlib._bootstrap._find_and_load()` to avoid locking when the module has been already imported and it's ready.

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Using `importlib.__import__()`, after this, does show a big difference:

Before:
```
$ ./python -c 'import timeit; print(timeit.timeit("__import__(\"timeit\")", setup="from importlib import __import__"))'
15.92248619502061
```

After:
```
$ ./python -c 'import timeit; print(timeit.timeit("__import__(\"timeit\")", setup="from importlib import __import__"))'
1.206068897008663
```

---

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This commit is contained in:

Germán Méndez Bravo 2021-08-12 11:23:29 -07:00 • committed by GitHub

parent 953d27261e

commit 03648a2a91

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3 changed files with 539 additions and 517 deletions

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