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cpython/Lib/importlib
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Germán Méndez Bravo 03648a2a91
bpo-43392: Optimize repeated calls to `__import__()` (GH-24735) 
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.

---

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
```

---
 		2021-08-12 11:23:29 -07:00
..
metadata bpo-44464: Remove special exclusion for flake8 in the deprecation warnings. (#26807) 2021-06-27 17:59:18 -04:00
__init__.py bpo-42135: Deprecate implementations of find_module() and find_loader() (GH-25169) 2021-04-06 08:56:57 -07:00
_abc.py bpo-42136: Deprecate module_repr() as found in importlib (GH-25022) 2021-03-26 11:55:07 -07:00
_adapters.py bpo-44771: Apply changes from importlib_resources 5.2.1 (GH-27436) 2021-07-29 21:05:05 -04:00
_bootstrap.py bpo-43392: Optimize repeated calls to `__import__()` (GH-24735) 2021-08-12 11:23:29 -07:00
_bootstrap_external.py bpo-44530: Add co_qualname field to PyCodeObject (GH-26941) 2021-07-07 12:21:51 +01:00
_common.py bpo-44771: Sync with importlib_resources 5.2.2, fixing refleak. (#27497) 2021-07-30 20:37:09 -04:00
_itertools.py bpo-44771: Apply changes from importlib_resources 5.2.1 (GH-27436) 2021-07-29 21:05:05 -04:00
_legacy.py bpo-44771: Apply changes from importlib_resources 5.2.1 (GH-27436) 2021-07-29 21:05:05 -04:00
abc.py bpo-42135: Deprecate implementations of find_module() and find_loader() (GH-25169) 2021-04-06 08:56:57 -07:00
machinery.py bpo-42403: Fix pyflakes warnings in importlib (GH-23396) 2020-11-19 11:20:57 +01:00
readers.py bpo-44771: Apply changes from importlib_resources 5.2.1 (GH-27436) 2021-07-29 21:05:05 -04:00
resources.py bpo-44771: Apply changes from importlib_resources 5.2.1 (GH-27436) 2021-07-29 21:05:05 -04:00
simple.py bpo-44771: Apply changes from importlib_resources 5.2.1 (GH-27436) 2021-07-29 21:05:05 -04:00
util.py bpo-43720: Update import-related stdlib deprecation messages to say they will be removed in Python 3.12 (GH-25167) 2021-04-03 15:31:15 -07:00