Chris Markiewicz 94f50f8ee6 gh-117983: Defer import of threading for lazy module loading (#120233) ... As noted in gh-117983, the import importlib.util can be triggered at interpreter startup under some circumstances, so adding threading makes it a potentially obligatory load. Lazy loading is not used in the stdlib, so this removes an unnecessary load for the majority of users and slightly increases the cost of the first lazily loaded module. An obligatory threading load breaks gevent, which monkeypatches the stdlib. Although unsupported, there doesn't seem to be an offsetting benefit to breaking their use case. For reference, here are benchmarks for the current main branch: ``` ❯ hyperfine -w 8 './python -c "import importlib.util"' Benchmark 1: ./python -c "import importlib.util" Time (mean ± σ): 9.7 ms ± 0.7 ms [User: 7.7 ms, System: 1.8 ms] Range (min … max): 8.4 ms … 13.1 ms 313 runs ``` And with this patch: ``` ❯ hyperfine -w 8 './python -c "import importlib.util"' Benchmark 1: ./python -c "import importlib.util" Time (mean ± σ): 8.4 ms ± 0.7 ms [User: 6.8 ms, System: 1.4 ms] Range (min … max): 7.2 ms … 11.7 ms 352 runs ``` Compare to: ``` ❯ hyperfine -w 8 './python -c pass' Benchmark 1: ./python -c pass Time (mean ± σ): 7.6 ms ± 0.6 ms [User: 5.9 ms, System: 1.6 ms] Range (min … max): 6.7 ms … 11.3 ms 390 runs ``` This roughly halves the import time of importlib.util.		2024-07-03 20:50:46 +00:00
..
__phello__
_pyrepl	gh-118908: Use __main__ for the default PyREPL namespace (#121054)	2024-06-26 15:01:10 -04:00
asyncio	gh-87744: fix waitpid race while calling send_signal in asyncio (#121126)	2024-07-01 10:17:36 +05:30
collections	gh-120417: Fix "imported but unused" linter warnings (#120461)	2024-06-14 20:39:50 +02:00
concurrent	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
ctypes	gh-61103: Support float and long double complex types in ctypes module (#121248)	2024-07-03 11:08:11 +02:00
curses	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
dbm	gh-120417: Remove unused imports in the stdlib (#120420)	2024-06-12 20:56:42 +02:00
email	Remove almost all unpaired backticks in docstrings (#119231)	2024-05-22 12:35:18 -04:00
encodings	gh-85287: Change codecs to raise precise UnicodeEncodeError and UnicodeDecodeError (#113674)	2024-03-17 04:58:42 +00:00
ensurepip	gh-120888: Bump bundled pip to 24.1.1 (#120889)	2024-06-27 09:09:54 +00:00
html
http	gh-120485: Add an override of allow_reuse_port on classes subclassing socketserver.TCPServer (GH-120488)	2024-06-16 13:15:03 +01:00
idlelib	gh-121008: Fix idlelib.run tests (#121046)	2024-06-26 15:41:16 +02:00
importlib	gh-117983: Defer import of threading for lazy module loading (#120233)	2024-07-03 20:50:46 +00:00
json	gh-95382: Improve performance of json encoder with indent (GH-118105)	2024-05-06 11:04:39 +03:00
logging	gh-105623 Fix performance degradation in logging RotatingFileHandler (GH-105887)	2024-06-27 16:44:40 +00:00
multiprocessing	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
pathlib	GH-73991: Support copying directory symlinks on older Windows (#120807)	2024-07-03 04:30:29 +01:00
pydoc_data	Python 3.13.0b1	2024-05-08 11:21:00 +02:00
re	gh-111259: Optimize complementary character sets in RE (GH-120742)	2024-06-20 07:19:32 +00:00
site-packages
sqlite3	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
sysconfig	gh-116622: Android sysconfig updates (#118352)	2024-05-01 16:47:54 +00:00
test	gh-118714: Make the pdb post-mortem restart/quit behavior more reasonable (#118725)	2024-07-03 11:30:20 -07:00
tkinter	gh-120211: Fix tkinter.ttk with Tcl/Tk 9.0 (GH-120213)	2024-06-07 10:49:07 +00:00
tomllib
turtledemo	gh-120633: Move scrollbar and remove tear-off menus in turtledemo (#120634)	2024-06-19 02:20:54 -04:00
unittest	gh-120732: Fix name passing to Mock, when using kwargs to create_autospec (#120737)	2024-06-19 21:35:11 +01:00
urllib	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
venv	gh-90329: Add _winapi.GetLongPathName and GetShortPathName and use in venv to reduce warnings (GH-117817)	2024-04-15 15:36:06 +01:00
wsgiref	Remove almost all unpaired backticks in docstrings (#119231)	2024-05-22 12:35:18 -04:00
xml	gh-120417: Fix "imported but unused" linter warnings (#120461)	2024-06-14 20:39:50 +02:00
xmlrpc	gh-120485: Add an override of allow_reuse_port on classes subclassing socketserver.TCPServer (GH-120488)	2024-06-16 13:15:03 +01:00
zipfile	gh-119588: Implement zipfile.Path.is_symlink (zipp 3.19.0). (#119591)	2024-06-03 11:13:07 -04:00
zoneinfo	gh-106233: Fix stacklevel in zoneinfo.InvalidTZPathWarning (GH-106234)	2024-02-06 15:08:56 +02:00
__future__.py
__hello__.py
_aix_support.py
_android_support.py	gh-116622: Redirect stdout and stderr to system log when embedded in an Android app (#118063)	2024-04-30 16:00:31 +02:00
_collections_abc.py	GH-120097: Make FrameLocalsProxy a mapping (#120101)	2024-06-19 17:54:13 +01:00
_colorize.py	gh-117225: Move colorize functionality to own internal module (#118283)	2024-05-01 12:27:06 -06:00
_compat_pickle.py
_compression.py
_ios_support.py	gh-119253: use ImportError in _ios_support (#119254)	2024-05-20 16:39:30 -04:00
_markupbase.py
_opcode_metadata.py	GH-120507: Lower the BEFORE_WITH and BEFORE_ASYNC_WITH instructions. (#120640)	2024-06-18 12:17:46 +01:00
_osx_support.py
_py_abc.py
_pydatetime.py	gh-120713: Normalize year with century for datetime.strftime (GH-120820)	2024-06-29 09:32:42 +03:00
_pydecimal.py	gh-118164: str(10**10000) hangs if the C _decimal module is missing (#118503)	2024-05-04 18:22:33 -05:00
_pyio.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
_pylong.py	gh-119057: Use better error messages for zero division (#119066)	2024-06-03 19:03:56 +03:00
_sitebuiltins.py
_strptime.py	GH-70647: Deprecate strptime day of month parsing without a year present to avoid leap-year bugs (GH-117107)	2024-04-03 14:19:49 +02:00
_threading_local.py
_weakrefset.py
abc.py
antigravity.py
argparse.py	gh-121018: Fix more cases of exiting in argparse when exit_on_error=False (GH-121056)	2024-06-28 17:21:59 +03:00
ast.py	gh-121210: handle nodes with missing attributes/fields in ast.compare (#121211)	2024-07-02 16:23:17 +05:30
base64.py	gh-118673: Remove shebang and executable bits from stdlib modules. (#119658)	2024-05-29 12:43:19 -04:00
bdb.py	gh-58933: Make pdb return to caller frame correctly when f_trace is not set (#118979)	2024-05-13 13:38:21 +01:00
bisect.py
bz2.py	gh-115961: Add name and mode attributes for compressed file-like objects (GH-116036)	2024-04-21 11:46:39 +03:00
calendar.py	gh-120567: Clarify weekday return in calendar.monthrange docstring (#120570)	2024-06-16 16:43:57 -04:00
cmd.py	Remove almost all unpaired backticks in docstrings (#119231)	2024-05-22 12:35:18 -04:00
code.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
codecs.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
codeop.py	gh-119521: Rename IncompleteInputError to _IncompleteInputError and remove from public API/ABI (GH-119680)	2024-06-24 14:08:12 +02:00
colorsys.py
compileall.py	gh-117205: Increase chunksize when compiling pyc in parallel (#117206)	2024-04-03 15:24:24 -07:00
configparser.py	Remove almost all unpaired backticks in docstrings (#119231)	2024-05-22 12:35:18 -04:00
contextlib.py
contextvars.py
copy.py	gh-121300: Add replace to copy.__all__ (#121302)	2024-07-03 20:33:56 +05:30
copyreg.py
cProfile.py	gh-118673: Remove shebang and executable bits from stdlib modules. (#119658)	2024-05-29 12:43:19 -04:00
csv.py	gh-114628: Display csv.Error without context (#115005)	2024-02-04 20:57:54 -05:00
dataclasses.py	gh-120417: Remove unused imports in the stdlib (#120420)	2024-06-12 20:56:42 +02:00
datetime.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
decimal.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
difflib.py	gh-115801: Only allow sequence of strings as input for difflib.unified_diff (GH-118333)	2024-06-10 14:06:18 +03:00
dis.py	gh-120780: Show attribute name for LOAD_SPECIAL in dis output (#120781)	2024-06-20 07:07:24 -07:00
doctest.py	Remove almost all unpaired backticks in docstrings (#119231)	2024-05-22 12:35:18 -04:00
enum.py	gh-118650: Exclude _repr_* methods from Enum's _sunder_ reservation (GH-118651)	2024-05-07 12:35:51 +02:00
filecmp.py	gh-57141: Add dircmp shallow option (GH-109499)	2024-03-04 17:27:43 +00:00
fileinput.py
fnmatch.py
fractions.py	gh-119838: Treat Fraction as a real value in mixed arithmetic operations with complex (GH-119839)	2024-06-03 12:29:01 +03:00
ftplib.py	Remove almost all unpaired backticks in docstrings (#119231)	2024-05-22 12:35:18 -04:00
functools.py	gh-121027: Make the functools.partial object a method descriptor (GH-121089)	2024-07-03 09:02:15 +03:00
genericpath.py	gh-117114: Make os.path.isdevdrive available on all platforms (GH-117115)	2024-03-25 22:55:11 +00:00
getopt.py	Remove almost all unpaired backticks in docstrings (#119231)	2024-05-22 12:35:18 -04:00
getpass.py
gettext.py
glob.py	GH-116380: Move pathlib-specific code from glob to pathlib._abc. (#120011)	2024-06-07 17:59:34 +01:00
graphlib.py
gzip.py	gh-112346: Always set OS byte to 255, simpler gzip.compress function. (GH-120486)	2024-06-15 18:46:39 +00:00
hashlib.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
heapq.py	gh-119721: Integrate documentation fixes into heapq module docstring. (gh-119722)	2024-05-29 11:39:34 -05:00
hmac.py
imaplib.py	Remove almost all unpaired backticks in docstrings (#119231)	2024-05-22 12:35:18 -04:00
inspect.py	gh-121027: Add a future warning in functools.partial.__get__ (#121086)	2024-06-27 11:47:20 +00:00
io.py
ipaddress.py	gh-120128: fix description of argument to ipaddress.collapse_addresses() (#120131)	2024-06-06 00:52:40 +03:00
keyword.py
linecache.py	linecache: Fix docstring location (#117948)	2024-04-16 15:37:18 -07:00
locale.py	gh-91565: Replace bugs.python.org links with Devguide/GitHub ones (GH-91568)	2024-04-01 13:02:07 +00:00
lzma.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
mailbox.py	gh-117467: Add preserving of mailbox owner on flush (GH-117510)	2024-04-04 13:32:53 +03:00
mimetypes.py	Remove almost all unpaired backticks in docstrings (#119231)	2024-05-22 12:35:18 -04:00
modulefinder.py	gh-114099 - Add iOS framework loading machinery. (GH-116454)	2024-03-19 08:36:19 -04:00
netrc.py
ntpath.py	gh-120417: Remove unused imports in the stdlib (#120420)	2024-06-12 20:56:42 +02:00
nturl2path.py
numbers.py
opcode.py	gh-120780: Show attribute name for LOAD_SPECIAL in dis output (#120781)	2024-06-20 07:07:24 -07:00
operator.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
optparse.py
os.py	gh-120057: Add os.environ.refresh() method (#120059)	2024-06-10 16:34:17 +00:00
pdb.py	gh-118714: Make the pdb post-mortem restart/quit behavior more reasonable (#118725)	2024-07-03 11:30:20 -07:00
pickle.py	gh-120380: fix Python implementation of pickle.Pickler for bytes and bytearray objects in protocol version 5. (GH-120422)	2024-06-21 14:22:38 +02:00
pickletools.py	gh-115146: Fix typo in pickletools.py documentation (GH-115148)	2024-02-08 10:12:58 +02:00
pkgutil.py
platform.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
plistlib.py
poplib.py
posixpath.py	pathlib ABCs: remove duplicate realpath() implementation. (#119178)	2024-06-05 18:54:50 +01:00
pprint.py
profile.py	gh-118673: Remove shebang and executable bits from stdlib modules. (#119658)	2024-05-29 12:43:19 -04:00
pstats.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
pty.py	gh-118824: Remove deprecated master_open and slave_open from pty (#118826)	2024-05-28 16:42:35 +03:00
py_compile.py
pyclbr.py
pydoc.py	gh-120541: Improve the "less" prompt in pydoc (GH-120543)	2024-06-15 20:56:40 +03:00
queue.py	gh-117531: Unblock getters after non-immediate queue shutdown (#117532)	2024-04-10 08:01:42 -07:00
quopri.py	gh-118673: Remove shebang and executable bits from stdlib modules. (#119658)	2024-05-29 12:43:19 -04:00
random.py	gh-118131: Command-line interface for the random module (#118132)	2024-05-05 06:30:03 +00:00
reprlib.py
rlcompleter.py	gh-113978: Ignore warnings on text completion inside REPL (#113979)	2024-05-21 18:28:21 +02:00
runpy.py
sched.py
secrets.py
selectors.py
shelve.py
shlex.py
shutil.py	GH-73991: Use same signature for shutil._rmtree_[un]safe(). (#120517)	2024-06-18 22:15:18 +01:00
signal.py
site.py	gh-121245: Amend d611c4c8e9 (correct import) (#121255)	2024-07-02 09:40:01 +00:00
smtplib.py	gh-118673: Remove shebang and executable bits from stdlib modules. (#119658)	2024-05-29 12:43:19 -04:00
socket.py	gh-110383: Document socket.makefile() accepts combined modes (#119150)	2024-05-21 16:23:50 +00:00
socketserver.py
sre_compile.py
sre_constants.py
sre_parse.py
ssl.py	gh-107361: strengthen default SSL context flags (#112389)	2024-03-06 13:44:58 -08:00
stat.py	gh-120417: Remove unused imports in the stdlib (#120420)	2024-06-12 20:56:42 +02:00
statistics.py	Refactor (mostly rearrange) the statistics module (gh-119930)	2024-06-01 22:07:46 -05:00
string.py
stringprep.py
struct.py	gh-120417: Add #noqa to used imports in the stdlib (#120421)	2024-06-13 16:14:50 +02:00
subprocess.py	gh-120417: Fix "imported but unused" linter warnings (#120461)	2024-06-14 20:39:50 +02:00
symtable.py	gh-119698: symtable: Fix merge race (#120779)	2024-06-20 05:42:30 +00:00
tabnanny.py	gh-120495: Fix incorrect exception handling in Tab Nanny (#120498)	2024-06-15 05:04:14 -06:00
tarfile.py	gh-118673: Remove shebang and executable bits from stdlib modules. (#119658)	2024-05-29 12:43:19 -04:00
tempfile.py
textwrap.py
this.py
threading.py	gh-114271: Fix race in Thread.join() (#114839)	2024-03-16 13:56:30 +01:00
timeit.py	gh-118673: Remove shebang and executable bits from stdlib modules. (#119658)	2024-05-29 12:43:19 -04:00
token.py
tokenize.py	gh-115154: Fix untokenize handling of unicode named literals (#115171)	2024-02-19 14:54:10 +00:00
trace.py	gh-118673: Remove shebang and executable bits from stdlib modules. (#119658)	2024-05-29 12:43:19 -04:00
traceback.py	gh-99180: Make StackSummary.should_show_carets private (#119554)	2024-05-25 17:08:32 +00:00
tracemalloc.py
tty.py
turtle.py
types.py
typing.py	gh-114053: Fix another edge case involving get_type_hints, PEP 695 and PEP 563 (#120272)	2024-06-25 16:53:18 +01:00
uuid.py	gh-113308: Remove some internal parts of uuid module (#115934)	2024-03-14 13:01:41 +03:00
warnings.py	gh-121163: Add "all" as an valid alias for "always" in warnings.simplefilter() (#121164)	2024-06-30 19:48:00 +02:00
wave.py
weakref.py
webbrowser.py	gh-118673: Remove shebang and executable bits from stdlib modules. (#119658)	2024-05-29 12:43:19 -04:00
zipapp.py
zipimport.py	Remove references to private symbols from zipimport module docstring (GH-119015)	2024-05-15 11:21:52 -05:00