gh-118761: Improve import time by lazy import of `warnings` by donbarbos · Pull Request #129765 · python/cpython · GitHub

Improve import time modules by lazy import warnings.
Remove unused warnings and struct from Lib/ctypes/_layout.py.

My hyperfine benchmarks:

First experiment in Main branch

➜  cpython git:(43e0240213) ✗ hyperfine --warmup 11 "./python -c 'import codeop'" "./python -c 'import zipimport'" "./python -c 'import ctypes'" "./python -c 'import hmac'" "./python -c 'import importlib'" "./python -c 'import logging'" "./python -c 'import pkgutil'" "./python -c 'import pydoc'" "./python -c 'import rlcompleter'" "./python -c 'import ssl'" "./python -c 'import tempfile'" "./python -c 'import traceback'" "./python -c 'import urllib'" "./python -c 'import xml'"
Benchmark 1: ./python -c 'import codeop'
  Time (mean ± σ):      24.6 ms ±   1.0 ms    [User: 21.8 ms, System: 2.7 ms]
  Range (min … max):    23.4 ms …  32.9 ms    112 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 2: ./python -c 'import zipimport'

Time (mean ± σ):      22.7 ms ±   0.8 ms    [User: 20.0 ms, System: 2.6 ms]

Range (min … max):    21.8 ms …  28.6 ms    128 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 3: ./python -c 'import ctypes'

Time (mean ± σ):      27.4 ms ±   0.5 ms    [User: 24.1 ms, System: 3.2 ms]

Range (min … max):    26.5 ms …  29.3 ms    108 runs
Benchmark 4: ./python -c 'import hmac'

Time (mean ± σ):      27.2 ms ±   0.5 ms    [User: 23.8 ms, System: 3.3 ms]

Range (min … max):    26.3 ms …  28.9 ms    108 runs
Benchmark 5: ./python -c 'import importlib'

Time (mean ± σ):      23.1 ms ±   0.9 ms    [User: 20.3 ms, System: 2.6 ms]

Range (min … max):    22.1 ms …  31.3 ms    122 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 6: ./python -c 'import logging'

Time (mean ± σ):      51.9 ms ±   0.6 ms    [User: 47.8 ms, System: 4.0 ms]

Range (min … max):    50.6 ms …  53.4 ms    56 runs
Benchmark 7: ./python -c 'import pkgutil'

Time (mean ± σ):      52.2 ms ±   0.9 ms    [User: 48.3 ms, System: 3.8 ms]

Range (min … max):    50.4 ms …  54.8 ms    58 runs
Benchmark 8: ./python -c 'import pydoc'

Time (mean ± σ):      89.2 ms ±   1.7 ms    [User: 83.4 ms, System: 5.6 ms]

Range (min … max):    87.2 ms …  95.0 ms    34 runs
Benchmark 9: ./python -c 'import rlcompleter'

Time (mean ± σ):      61.8 ms ±   1.1 ms    [User: 57.0 ms, System: 4.6 ms]

Range (min … max):    60.1 ms …  65.8 ms    49 runs
Benchmark 10: ./python -c 'import ssl'

Time (mean ± σ):      47.6 ms ±   1.8 ms    [User: 43.1 ms, System: 4.3 ms]

Range (min … max):    45.1 ms …  57.6 ms    63 runs
Benchmark 11: ./python -c 'import tempfile'

Time (mean ± σ):      47.2 ms ±   1.1 ms    [User: 42.9 ms, System: 4.3 ms]

Range (min … max):    45.2 ms …  49.9 ms    63 runs
Benchmark 12: ./python -c 'import traceback'

Time (mean ± σ):      43.5 ms ±   1.2 ms    [User: 39.8 ms, System: 3.5 ms]

Range (min … max):    41.7 ms …  46.8 ms    65 runs
Benchmark 13: ./python -c 'import urllib'

Time (mean ± σ):      25.9 ms ±   1.7 ms    [User: 22.8 ms, System: 2.9 ms]

Range (min … max):    22.5 ms …  34.3 ms    128 runs
Benchmark 14: ./python -c 'import xml'

Time (mean ± σ):      26.2 ms ±   0.9 ms    [User: 23.5 ms, System: 2.6 ms]

Range (min … max):    24.5 ms …  29.2 ms    114 runs
Summary

./python -c 'import zipimport' ran

1.02 ± 0.05 times faster than ./python -c 'import importlib'

1.08 ± 0.06 times faster than ./python -c 'import codeop'

1.14 ± 0.09 times faster than ./python -c 'import urllib'

1.16 ± 0.06 times faster than ./python -c 'import xml'

1.20 ± 0.05 times faster than ./python -c 'import hmac'

1.21 ± 0.05 times faster than ./python -c 'import ctypes'

1.92 ± 0.09 times faster than ./python -c 'import traceback'

2.08 ± 0.09 times faster than ./python -c 'import tempfile'

2.10 ± 0.11 times faster than ./python -c 'import ssl'

2.29 ± 0.09 times faster than ./python -c 'import logging'

2.30 ± 0.09 times faster than ./python -c 'import pkgutil'

2.72 ± 0.11 times faster than ./python -c 'import rlcompleter'

3.93 ± 0.16 times faster than ./python -c 'import pydoc'

Second experiment in Main branch

➜  cpython git:(43e0240213) ✗ hyperfine --warmup 11 "./python -c 'import codeop'" "./python -c 'import zipimport'" "./python -c 'import ctypes'" "./python -c 'import hmac'" "./python -c 'import importlib'" "./python -c 'import logging'" "./python -c 'import pkgutil'" "./python -c 'import pydoc'" "./python -c 'import rlcompleter'" "./python -c 'import ssl'" "./python -c 'import tempfile'" "./python -c 'import traceback'" "./python -c 'import urllib'" "./python -c 'import xml'"
Benchmark 1: ./python -c 'import codeop'
  Time (mean ± σ):      24.5 ms ±   1.6 ms    [User: 21.7 ms, System: 2.8 ms]
  Range (min … max):    23.5 ms …  39.7 ms    119 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 2: ./python -c 'import zipimport'

Time (mean ± σ):      22.8 ms ±   1.0 ms    [User: 20.4 ms, System: 2.3 ms]

Range (min … max):    21.7 ms …  30.3 ms    129 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 3: ./python -c 'import ctypes'

Time (mean ± σ):      27.6 ms ±   0.9 ms    [User: 24.5 ms, System: 2.9 ms]

Range (min … max):    26.5 ms …  34.3 ms    105 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 4: ./python -c 'import hmac'

Time (mean ± σ):      27.1 ms ±   0.6 ms    [User: 23.7 ms, System: 3.3 ms]

Range (min … max):    26.2 ms …  28.8 ms    108 runs
Benchmark 5: ./python -c 'import importlib'

Time (mean ± σ):      23.9 ms ±   1.2 ms    [User: 21.4 ms, System: 2.3 ms]

Range (min … max):    22.0 ms …  26.4 ms    126 runs
Benchmark 6: ./python -c 'import logging'

Time (mean ± σ):      59.0 ms ±   2.9 ms    [User: 54.6 ms, System: 4.3 ms]

Range (min … max):    56.5 ms …  73.0 ms    52 runs
Benchmark 7: ./python -c 'import pkgutil'

Time (mean ± σ):      61.2 ms ±   3.9 ms    [User: 56.1 ms, System: 5.0 ms]

Range (min … max):    55.4 ms …  68.4 ms    53 runs
Benchmark 8: ./python -c 'import pydoc'

Time (mean ± σ):     114.4 ms ±   3.4 ms    [User: 106.5 ms, System: 7.7 ms]

Range (min … max):   111.3 ms … 122.7 ms    26 runs
Benchmark 9: ./python -c 'import rlcompleter'

Time (mean ± σ):      78.8 ms ±   1.2 ms    [User: 72.5 ms, System: 6.1 ms]

Range (min … max):    76.7 ms …  81.0 ms    38 runs
Benchmark 10: ./python -c 'import ssl'

Time (mean ± σ):      58.8 ms ±   0.9 ms    [User: 53.4 ms, System: 5.3 ms]

Range (min … max):    57.4 ms …  61.6 ms    50 runs
Benchmark 11: ./python -c 'import tempfile'

Time (mean ± σ):      59.8 ms ±   1.8 ms    [User: 54.2 ms, System: 5.5 ms]

Range (min … max):    57.4 ms …  69.4 ms    50 runs
Benchmark 12: ./python -c 'import traceback'

Time (mean ± σ):      54.8 ms ±   1.0 ms    [User: 50.3 ms, System: 4.4 ms]

Range (min … max):    52.4 ms …  56.9 ms    56 runs
Benchmark 13: ./python -c 'import urllib'

Time (mean ± σ):      29.5 ms ±   0.6 ms    [User: 26.2 ms, System: 3.1 ms]

Range (min … max):    28.3 ms …  31.9 ms    100 runs
Benchmark 14: ./python -c 'import xml'

Time (mean ± σ):      29.7 ms ±   1.1 ms    [User: 26.7 ms, System: 3.0 ms]

Range (min … max):    28.2 ms …  38.3 ms    102 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Summary

./python -c 'import zipimport' ran

1.05 ± 0.07 times faster than ./python -c 'import importlib'

1.08 ± 0.08 times faster than ./python -c 'import codeop'

1.19 ± 0.06 times faster than ./python -c 'import hmac'

1.21 ± 0.07 times faster than ./python -c 'import ctypes'

1.29 ± 0.06 times faster than ./python -c 'import urllib'

1.30 ± 0.07 times faster than ./python -c 'import xml'

2.40 ± 0.11 times faster than ./python -c 'import traceback'

2.58 ± 0.12 times faster than ./python -c 'import ssl'

2.58 ± 0.17 times faster than ./python -c 'import logging'

2.62 ± 0.14 times faster than ./python -c 'import tempfile'

2.68 ± 0.20 times faster than ./python -c 'import pkgutil'

3.45 ± 0.16 times faster than ./python -c 'import rlcompleter'

5.01 ± 0.26 times faster than ./python -c 'import pydoc'

First experiment in PR branch

➜  cpython git:(issue-118761) ✗ hyperfine --warmup 11 "./python -c 'import codeop'" "./python -c 'import zipimport'" "./python -c 'import ctypes'" "./python -c 'import hmac'" "./python -c 'import importlib'" "./python -c 'import logging'" "./python -c 'import pkgutil'" "./python -c 'import pydoc'" "./python -c 'import rlcompleter'" "./python -c 'import ssl'" "./python -c 'import tempfile'" "./python -c 'import traceback'" "./python -c 'import urllib'" "./python -c 'import xml'"
Benchmark 1: ./python -c 'import codeop'
  Time (mean ± σ):      23.5 ms ±   1.0 ms    [User: 21.0 ms, System: 2.5 ms]
  Range (min … max):    22.6 ms …  33.2 ms    121 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 2: ./python -c 'import zipimport'

Time (mean ± σ):      22.6 ms ±   0.8 ms    [User: 20.3 ms, System: 2.2 ms]

Range (min … max):    21.6 ms …  29.5 ms    127 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 3: ./python -c 'import ctypes'

Time (mean ± σ):      27.3 ms ±   0.5 ms    [User: 24.3 ms, System: 3.0 ms]

Range (min … max):    26.4 ms …  29.0 ms    107 runs
Benchmark 4: ./python -c 'import hmac'

Time (mean ± σ):      26.2 ms ±   0.6 ms    [User: 23.3 ms, System: 2.9 ms]

Range (min … max):    25.3 ms …  27.7 ms    108 runs
Benchmark 5: ./python -c 'import importlib'

Time (mean ± σ):      22.9 ms ±   1.3 ms    [User: 20.6 ms, System: 2.3 ms]

Range (min … max):    22.0 ms …  35.4 ms    125 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 6: ./python -c 'import logging'

Time (mean ± σ):      51.3 ms ±   0.8 ms    [User: 47.3 ms, System: 3.9 ms]

Range (min … max):    49.8 ms …  53.7 ms    58 runs
Benchmark 7: ./python -c 'import pkgutil'

Time (mean ± σ):      51.1 ms ±   0.8 ms    [User: 47.3 ms, System: 3.8 ms]

Range (min … max):    49.5 ms …  53.6 ms    58 runs
Benchmark 8: ./python -c 'import pydoc'

Time (mean ± σ):      85.8 ms ±   2.5 ms    [User: 80.5 ms, System: 5.2 ms]

Range (min … max):    84.4 ms …  99.8 ms    35 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 9: ./python -c 'import rlcompleter'

Time (mean ± σ):      60.6 ms ±   0.8 ms    [User: 55.8 ms, System: 4.6 ms]

Range (min … max):    59.2 ms …  63.9 ms    49 runs
Benchmark 10: ./python -c 'import ssl'

Time (mean ± σ):      45.4 ms ±   1.7 ms    [User: 41.3 ms, System: 4.0 ms]

Range (min … max):    43.9 ms …  58.1 ms    65 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 11: ./python -c 'import tempfile'

Time (mean ± σ):      46.1 ms ±   1.7 ms    [User: 41.8 ms, System: 4.2 ms]

Range (min … max):    44.3 ms …  58.2 ms    65 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 12: ./python -c 'import traceback'

Time (mean ± σ):      42.4 ms ±   0.8 ms    [User: 38.7 ms, System: 3.4 ms]

Range (min … max):    40.4 ms …  44.3 ms    70 runs
Benchmark 13: ./python -c 'import urllib'

Time (mean ± σ):      22.9 ms ±   0.6 ms    [User: 20.4 ms, System: 2.4 ms]

Range (min … max):    22.0 ms …  24.8 ms    122 runs
Benchmark 14: ./python -c 'import xml'

Time (mean ± σ):      24.6 ms ±   1.4 ms    [User: 22.1 ms, System: 2.4 ms]

Range (min … max):    22.2 ms …  33.0 ms    126 runs
Summary

./python -c 'import zipimport' ran

1.01 ± 0.04 times faster than ./python -c 'import urllib'

1.01 ± 0.07 times faster than ./python -c 'import importlib'

1.04 ± 0.06 times faster than ./python -c 'import codeop'

1.09 ± 0.07 times faster than ./python -c 'import xml'

1.16 ± 0.05 times faster than ./python -c 'import hmac'

1.21 ± 0.05 times faster than ./python -c 'import ctypes'

1.88 ± 0.07 times faster than ./python -c 'import traceback'

2.01 ± 0.10 times faster than ./python -c 'import ssl'

2.04 ± 0.10 times faster than ./python -c 'import tempfile'

2.26 ± 0.08 times faster than ./python -c 'import pkgutil'

2.27 ± 0.09 times faster than ./python -c 'import logging'

2.68 ± 0.10 times faster than ./python -c 'import rlcompleter'

3.80 ± 0.17 times faster than ./python -c 'import pydoc'

Second experiment in PR branch

➜  cpython git:(issue-118761) ✗ hyperfine --warmup 11 "./python -c 'import codeop'" "./python -c 'import zipimport'" "./python -c 'import ctypes'" "./python -c 'import hmac'" "./python -c 'import importlib'" "./python -c 'import logging'" "./python -c 'import pkgutil'" "./python -c 'import pydoc'" "./python -c 'import rlcompleter'" "./python -c 'import ssl'" "./python -c 'import tempfile'" "./python -c 'import traceback'" "./python -c 'import urllib'" "./python -c 'import xml'"
Benchmark 1: ./python -c 'import codeop'
  Time (mean ± σ):      23.7 ms ±   1.0 ms    [User: 21.0 ms, System: 2.6 ms]
  Range (min … max):    22.7 ms …  31.0 ms    122 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 2: ./python -c 'import zipimport'

Time (mean ± σ):      22.6 ms ±   0.5 ms    [User: 20.1 ms, System: 2.4 ms]

Range (min … max):    21.7 ms …  24.0 ms    126 runs
Benchmark 3: ./python -c 'import ctypes'

Time (mean ± σ):      27.6 ms ±   0.5 ms    [User: 24.7 ms, System: 2.8 ms]

Range (min … max):    26.5 ms …  28.9 ms    104 runs
Benchmark 4: ./python -c 'import hmac'

Time (mean ± σ):      26.5 ms ±   1.0 ms    [User: 23.2 ms, System: 3.2 ms]

Range (min … max):    25.4 ms …  33.1 ms    111 runs
Benchmark 5: ./python -c 'import importlib'

Time (mean ± σ):      23.0 ms ±   0.7 ms    [User: 20.6 ms, System: 2.4 ms]

Range (min … max):    22.1 ms …  25.5 ms    121 runs
Benchmark 6: ./python -c 'import logging'

Time (mean ± σ):      51.5 ms ±   0.9 ms    [User: 47.2 ms, System: 4.2 ms]

Range (min … max):    49.9 ms …  54.6 ms    58 runs
Benchmark 7: ./python -c 'import pkgutil'

Time (mean ± σ):      51.9 ms ±   1.4 ms    [User: 47.8 ms, System: 4.0 ms]

Range (min … max):    49.7 ms …  58.4 ms    57 runs
Benchmark 8: ./python -c 'import pydoc'

Time (mean ± σ):      88.1 ms ±   2.2 ms    [User: 82.1 ms, System: 5.8 ms]

Range (min … max):    85.1 ms …  93.3 ms    34 runs
Benchmark 9: ./python -c 'import rlcompleter'

Time (mean ± σ):      63.6 ms ±   3.5 ms    [User: 58.6 ms, System: 4.9 ms]

Range (min … max):    59.4 ms …  76.9 ms    38 runs
Benchmark 10: ./python -c 'import ssl'

Time (mean ± σ):      50.6 ms ±   1.5 ms    [User: 46.2 ms, System: 4.3 ms]

Range (min … max):    48.9 ms …  60.0 ms    60 runs
Warning: Statistical outliers were detected. Consider re-running this benchmark on a quiet system without any interferences from other programs. It might help to use the '--warmup' or '--prepare' options.
Benchmark 11: ./python -c 'import tempfile'

Time (mean ± σ):      50.7 ms ±   0.8 ms    [User: 45.7 ms, System: 4.8 ms]

Range (min … max):    49.1 ms …  53.1 ms    59 runs
Benchmark 12: ./python -c 'import traceback'

Time (mean ± σ):      54.3 ms ±   3.5 ms    [User: 49.3 ms, System: 4.9 ms]

Range (min … max):    46.8 ms …  71.1 ms    63 runs
Benchmark 13: ./python -c 'import urllib'

Time (mean ± σ):      30.0 ms ±   0.6 ms    [User: 26.9 ms, System: 3.0 ms]

Range (min … max):    28.4 ms …  32.0 ms    97 runs
Benchmark 14: ./python -c 'import xml'

Time (mean ± σ):      29.9 ms ±   0.7 ms    [User: 26.7 ms, System: 3.1 ms]

Range (min … max):    28.4 ms …  32.1 ms    100 runs
Summary

./python -c 'import zipimport' ran

1.02 ± 0.04 times faster than ./python -c 'import importlib'

1.05 ± 0.05 times faster than ./python -c 'import codeop'

1.17 ± 0.05 times faster than ./python -c 'import hmac'

1.22 ± 0.04 times faster than ./python -c 'import ctypes'

1.32 ± 0.04 times faster than ./python -c 'import xml'

1.33 ± 0.04 times faster than ./python -c 'import urllib'

2.24 ± 0.08 times faster than ./python -c 'import ssl'

2.24 ± 0.06 times faster than ./python -c 'import tempfile'

2.28 ± 0.06 times faster than ./python -c 'import logging'

2.30 ± 0.08 times faster than ./python -c 'import pkgutil'

2.40 ± 0.16 times faster than ./python -c 'import traceback'

2.82 ± 0.17 times faster than ./python -c 'import rlcompleter'

3.90 ± 0.13 times faster than ./python -c 'import pydoc'

Issue: Improve import time of various stdlib modules #118761

…ayL_A.rst Co-authored-by: Wulian233 <1055917385@qq.com>

Thanks for doing this. I did it for hmac locally since I'm implementing the HACL* hmac nut it's good to see it done here.

Co-authored-by: Vinay Sajip <vinay_sajip@yahoo.co.uk>

Please revert the whitespaces and unrelated new lines changes (unless the codeowners tell you that you can keep the changes though)

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

We should verify that each change has non-noise benefits rather than changing everything at once in an omnibus PR. @donbarbos also please present your motivating statistics in a more readable manner, I expect to see a comparison of each module against baseline, rather than four large log outputs.

A

I ran a test for importlib.resources, and this change if anything makes things worse:

 cpython issue-118761 🐚 hyperfine --warmup 11 "./python.exe -c 'import importlib.resources'"
Benchmark 1: ./python.exe -c 'import importlib.resources'
  Time (mean ± σ):      26.6 ms ±   0.5 ms    [User: 20.9 ms, System: 3.8 ms]
  Range (min … max):    25.4 ms …  28.7 ms    101 runs
 
 cpython issue-118761 [1] 🐚 git checkout @$(git merge-base HEAD main)
HEAD is now at 0fef47e5bbd gh-55454: Add IMAP4 IDLE support to imaplib (#122542)
 cpython 0fef47e5bbd 🐚 hyperfine --warmup 11 "./python.exe -c 'import importlib.resources'"
Benchmark 1: ./python.exe -c 'import importlib.resources'
  Time (mean ± σ):      25.9 ms ±   0.6 ms    [User: 21.4 ms, System: 3.8 ms]
  Range (min … max):    24.8 ms …  27.6 ms    98 runs

Sounds like we should revert those changes from this PR.

I'll close this PR as the contributor has opened some smaller individual changes.

A

Improve import time of codeop

acaa51c

bedevere-app Bot added the awaiting review label Feb 7, 2025

bedevere-app Bot mentioned this pull request Feb 7, 2025

Improve import time of various stdlib modules #118761

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Always lazy import warnings

ca2f8bc

donbarbos requested review from FFY00, brettcannon, ericsnowcurrently, gpshead, jaraco, ncoghlan, picnixz, vsajip and warsaw as code owners February 7, 2025 04:09

donbarbos changed the title gh-118761: Improve import time of codeop gh-118761: Improve import time by lazy import of warnings Feb 7, 2025

Merge branch 'main' into issue-118761

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Wulian233 reviewed Feb 7, 2025

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Comment thread Misc/NEWS.d/next/Library/2025-02-07-05-55-08.gh-issue-118761.aayL_A.rst Outdated

donbarbos and others added 2 commits February 7, 2025 04:45

Update Misc/NEWS.d/next/Library/2025-02-07-05-55-08.gh-issue-118761.a…

f88c5b1

…ayL_A.rst Co-authored-by: Wulian233 <1055917385@qq.com>

Correct my mistake

f1f77a5

vsajip reviewed Feb 7, 2025

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Update 2025-02-07-05-55-08.gh-issue-118761.aayL_A.rst

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Co-authored-by: Vinay Sajip <vinay_sajip@yahoo.co.uk>

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gh-118761: Improve import time by lazy import of traceback #129811

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donbarbos added 2 commits February 7, 2025 19:59

Revert changing styles

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Revert more

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Add suggestions

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brettcannon requested review from brettcannon and removed request for brettcannon February 12, 2025 22:07

AA-Turner closed this Feb 17, 2025

gh-118761: Improve import time by lazy import of `warnings` by donbarbos · Pull Request #129765 · python/cpython · GitHub

Uh oh!

Uh oh!

gh-118761: Improve import time by lazy import of warnings - #129765

gh-118761: Improve import time by lazy import of warnings#129765
donbarbos wants to merge 9 commits into
python:mainfrom
donbarbos:issue-118761

donbarbos commented Feb 7, 2025 •
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gh-118761: Improve import time by lazy import of `warnings` by donbarbos · Pull Request #129765 · python/cpython · GitHub

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gh-118761: Improve import time by lazy import of warnings - #129765

gh-118761: Improve import time by lazy import of warnings#129765donbarbos wants to merge 9 commits intopython:mainpython/cpython:mainfrom donbarbos:issue-118761donbarbos/cpython:issue-118761Copy head branch name to clipboard

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donbarbos commented Feb 7, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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My hyperfine benchmarks:

First experiment in Main branch

Second experiment in Main branch

First experiment in PR branch

Second experiment in PR branch

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gh-118761: Improve import time by lazy import of warnings#129765
donbarbos wants to merge 9 commits into
python:mainfrom
donbarbos:issue-118761

donbarbos commented Feb 7, 2025 •
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