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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
..
clinic bpo-20201: variadic arguments support for AC (GH-18609) 2021-07-16 18:43:02 +03:00
Python-ast.c bpo-11105: Do not crash when compiling recursive ASTs (GH-20594) 2021-06-03 21:01:02 +01:00
README Issue #18093: Factor out the programs that embed the runtime 2014-07-25 21:52:14 +10:00
_warnings.c bpo-44590: Lazily allocate frame objects (GH-27077) 2021-07-26 11:22:16 +01:00
adaptive.md bpo-44854: Remove trailing whitespaces (GH-27689) 2021-08-09 21:32:54 +03:00
asdl.c bpo-43244: Remove ast.h, asdl.h, Python-ast.h headers (GH-24933) 2021-03-23 20:47:40 +01:00
ast.c bpo-43897: Reject "_" captures and top-level MatchStar in the AST validator (GH-27432) 2021-07-28 17:24:18 -07:00
ast_opt.c bpo-28307: Tests and fixes for optimization of C-style formatting (GH-26318) 2021-05-23 19:06:48 +03:00
ast_unparse.c bpo-43892: Make match patterns explicit in the AST (GH-25585) 2021-04-28 22:58:44 -07:00
bltinmodule.c bpo-44856: Possible reference leak in error paths of update_bases() and __build_class__ (GH-27647) 2021-08-07 12:10:14 +02:00
bootstrap_hash.c bpo-44611: Use BCryptGenRandom instead of CryptGenRandom on Windows (GH-27168) 2021-07-23 23:04:30 +09:00
ceval.c bpo-44890: collect specialization stats if Py_DEBUG (GH-27731) 2021-08-12 12:15:06 +01:00
ceval_gil.h bpo-43268: Pass interp rather than tstate to internal functions (GH-24580) 2021-02-19 15:10:45 +01:00
codecs.c bpo-42157: unicodedata avoids references to UCD_Type (GH-22990) 2020-10-26 19:19:36 +01:00
compile.c Remove unused variable. (GH-27677) 2021-08-09 14:44:26 +01:00
condvar.h bpo-44740: Lowercase "internet" and "web" where appropriate. (#27378) 2021-07-27 00:11:55 +02:00
context.c bpo-43268: Pass interp rather than tstate to internal functions (GH-24580) 2021-02-19 15:10:45 +01:00
dtoa.c Revert "bpo-40521: Make dtoa bigint free list per-interpreter (GH-24821)" (GH-24964) 2021-03-22 11:58:59 +01:00
dup2.c bpo-32150: Expand tabs to spaces in C files. (#4583) 2017-11-28 17:56:10 +02:00
dynamic_annotations.c bpo-32241: Add the const qualifire to declarations of umodifiable strings. (#4748) 2017-12-12 13:55:04 +02:00
dynload_hpux.c bpo-41894: Fix UnicodeDecodeError while loading native module (GH-22466) 2020-10-15 10:53:27 +09:00
dynload_shlib.c bpo-43895: Remove an unnecessary cache of shared object handles (GH-25487) 2021-07-07 16:26:06 -07:00
dynload_stub.c Issue #13959: Re-implement imp.get_suffixes() in Lib/imp.py. 2012-05-04 15:20:40 -04:00
dynload_win.c bpo-36346: Make using the legacy Unicode C API optional (GH-21437) 2020-07-10 23:26:06 +03:00
errors.c bpo-25782: avoid hang in PyErr_SetObject when current exception has a cycle in its context chain (GH-27626) 2021-08-10 11:37:25 +02:00
fileutils.c bpo-44849: Fix os.set_inheritable() on FreeBSD 14 with O_PATH (GH-27623) 2021-08-06 15:15:10 +02:00
formatter_unicode.c bpo-28146: Fix a confusing error message in str.format() (GH-24213) 2021-05-13 13:55:55 -07:00
frame.c bpo-44590: Lazily allocate frame objects (GH-27077) 2021-07-26 11:22:16 +01:00
frozen.c bpo-43372: Use _freeze_importlib for regen-frozen. (GH-24759) 2021-03-06 13:34:03 -08:00
frozen_hello.h bpo-44530: Add co_qualname field to PyCodeObject (GH-26941) 2021-07-07 12:21:51 +01:00
frozenmain.c bpo-44131: Py_FrozenMain() uses PyConfig_SetBytesArgv() (GH-26201) 2021-05-20 12:08:05 +02:00
future.c bpo-38605: Revert making 'from __future__ import annotations' the default (GH-25490) 2021-04-21 12:41:19 +01:00
getargs.c bpo-20291: Fix MSVC warnings in getargs.c (GH-27211) 2021-07-17 14:09:18 +03:00
getcompiler.c closes bpo-43278: remove unnecessary leading '\n' from COMPILER when build with GCC/Clang (GH-24606) 2021-02-25 20:24:21 -08:00
getcopyright.c Bring Python into the new year. (GH-24036) 2021-01-02 00:37:23 +09:00
getopt.c bpo-40527: Fix command line argument parsing (GH-19955) 2020-05-06 22:22:17 +09:00
getplatform.c bpo-32150: Expand tabs to spaces in C files. (#4583) 2017-11-28 17:56:10 +02:00
getversion.c bpo-32150: Expand tabs to spaces in C files. (#4583) 2017-11-28 17:56:10 +02:00
hamt.c bpo-29882: Add _Py_popcount32() function (GH-20518) 2020-06-08 16:30:33 +02:00
hashtable.c bpo-41061: Fix incorrect expressions in hashtable (GH-21028) 2020-06-22 00:41:48 -07:00
import.c bpo-44441: _PyImport_Fini2() resets PyImport_Inittab (GH-26874) 2021-06-23 14:13:27 +02:00
importdl.c bpo-1635741: Fix ref leak in _PyWarnings_Init() error path (GH-23151) 2020-11-04 17:33:06 +01:00
importdl.h PEP 489: Multi-phase extension module initialization 2015-05-23 22:24:10 +10:00
importlib.h bpo-43392: Optimize repeated calls to `__import__()` (GH-24735) 2021-08-12 11:23:29 -07:00
importlib_external.h bpo-44885: Correct the ast locations of f-strings with format specs and repeated expressions (GH-27729) 2021-08-12 17:13:30 +01:00
importlib_zipimport.h bpo-44885: Correct the ast locations of f-strings with format specs and repeated expressions (GH-27729) 2021-08-12 17:13:30 +01:00
initconfig.c bpo-43950: Add option to opt-out of PEP-657 (GH-27023) 2021-07-07 20:07:12 +01:00
makeopcodetargets.py bpo-44337: Port LOAD_ATTR to PEP 659 adaptive interpreter (GH-26595) 2021-06-10 08:46:01 +01:00
marshal.c bpo-44530: Add co_qualname field to PyCodeObject (GH-26941) 2021-07-07 12:21:51 +01:00
modsupport.c bpo-1635741: Add PyModule_AddObjectRef() function (GH-23122) 2020-11-04 13:59:15 +01:00
mysnprintf.c bpo-36020: Require vsnprintf() to build Python (GH-20899) 2020-06-16 00:54:44 +02:00
mystrtoul.c bpo-37752: Delete redundant Py_CHARMASK in normalizestring() (GH-15095) 2019-09-10 17:04:08 +01:00
opcode_targets.h bpo-44826: Specialize STORE_ATTR (GH-27590) 2021-08-09 10:40:21 +01:00
pathconfig.c bpo-42260: Fix _PyConfig_Read() if compute_path_config=0 (GH-23220) 2020-11-10 21:10:22 +01:00
preconfig.c bpo-43510: Implement PEP 597 opt-in EncodingWarning. (GH-19481) 2021-03-29 12:28:14 +09:00
pyarena.c bpo-43244: Remove the pyarena.h header (GH-25007) 2021-03-24 02:23:01 +01:00
pyctype.c
…
pyfpe.c bpo-29137: Remove fpectl module (#4789) 2018-01-05 23:15:34 -08:00
pyhash.c bpo-43475: Fix worst case collision behavior for NaN instances (GH-25493) 2021-04-22 08:34:57 -07:00
pylifecycle.c bpo-44584: Deprecate PYTHONTHREADDEBUG env var (GH-27065) 2021-08-06 13:11:12 +02:00
pymath.c bpo-29782: Consolidate _Py_Bit_Length() (GH-20739) 2020-06-15 14:33:48 +02:00
pystate.c bpo-44590: Lazily allocate frame objects (GH-27077) 2021-07-26 11:22:16 +01:00
pystrcmp.c bpo-41524: fix pointer bug in PyOS_mystr{n}icmp (GH-21845) 2020-08-27 14:45:25 +09:00
pystrhex.c bpo-40313: speed up bytes.hex() (GH-19594) 2020-04-20 17:17:52 -07:00
pystrtod.c bpo-42519: Replace PyMem_MALLOC() with PyMem_Malloc() (GH-23586) 2020-12-01 09:56:42 +01:00
pythonrun.c bpo-43914: Highlight invalid ranges in SyntaxErrors (#25525) 2021-04-23 14:27:05 +01:00
pytime.c bpo-37205: time.time() cannot fail with fatal error (GH-23314) 2020-11-16 16:08:05 +01:00
specialize.c bpo-44890: collect specialization stats if Py_DEBUG (GH-27731) 2021-08-12 12:15:06 +01:00
stdlib_module_names.h bpo-44353: Implement typing.NewType __call__ method in C (#27262) 2021-07-22 23:06:54 +02:00
structmember.c bpo-44655: Include the name of the type in unset __slots__ attribute errors (GH-27199) 2021-07-17 00:34:46 +01:00
suggestions.c bpo-44590: Lazily allocate frame objects (GH-27077) 2021-07-26 11:22:16 +01:00
symtable.c bpo-33346: Allow async comprehensions inside implicit async comprehensions (GH-6766) 2021-07-13 22:27:50 +01:00
sysmodule.c bpo-44590: Lazily allocate frame objects (GH-27077) 2021-07-26 11:22:16 +01:00
thread.c bpo-44584: Deprecate PYTHONTHREADDEBUG env var (GH-27065) 2021-08-06 13:11:12 +02:00
thread_nt.h bpo-41299: Reduce lag in Windows threading timeouts by using a higher precision time source (GH-26568) 2021-06-07 21:26:02 +01:00
thread_pthread.h bpo-31904: Define THREAD_STACK_SIZE for VxWorks (GH-23718) 2020-12-09 22:47:28 +01:00
traceback.c bpo-44590: Lazily allocate frame objects (GH-27077) 2021-07-26 11:22:16 +01:00
wordcode_helpers.h bpo-31338 (#3374) 2017-09-14 18:13:16 -07:00

README 

Miscellaneous source files for the main Python shared library