Upgrade to Pro — share decks privately, control downloads, hide ads and more …

CPython's bug in feature that nobody uses

Sponsored · Ship Features Fearlessly Turn features on and off without deploys. Used by thousands of Ruby developers. →
Avatar for dv dv
June 06, 2015
Technology
0
120

CPython's bug in feature that nobody uses

Avatar for dv

dv

June 06, 2015
Tweet

More Decks by dv

See All by dv
Python module in Rust
Avatar for dv wdv4758h
0
190
First try for CAS, SymPy with codegen
Avatar for dv wdv4758h
0
700
Android Memory Leak Profiling - VMFive
Avatar for dv wdv4758h
0
300
Vim 手指健康操
Avatar for dv wdv4758h
3
920
FreeBSD ports system
Avatar for dv wdv4758h
0
150

Other Decks in Technology

See All in Technology
CyberAgentの生成AI戦略 〜変わるものと変わらないもの〜
Avatar for katayan katayan
0
280
頼れる Agentic AI を支える Datadog のオブザーバビリティ / Powering Reliable Agentic AI with Datadog Observability
Avatar for Kento Kimura aoto
PRO
0
240
A Casual Introduction to RISC-V
Avatar for Masanori Ogino omasanori
0
500
Phase06_ClaudeCode実践
Avatar for overflow ,Inc overflowinc
0
220
20260321_エンベディングってなに？RAGってなに？エンベディングの説明とGemini Embedding 2 の紹介
Avatar for tsho tsho
0
130
夢の無限スパゲッティ製造機 #phperkaigi
Avatar for hideki kinjyo o0h
PRO
0
290
Visional 28新卒プロダクト職（エンジニア/デザイナー）向け 会社説明資料 / Visional Company Briefing for Newgrads 28
Avatar for Visional Engineering ＆ Design visional_engineering_and_design
1
110
【社内勉強会】新年度からコーディングエージェントを使いこなす - 構造と制約で引き出すClaude Codeの実践知
Avatar for nwiizo nwiizo
5
3.8k
めちゃくちゃ開発するQAエンジニアになって感じたメリットとこれからの課題感
Avatar for yama-cha-n ryuhei0000yamamoto
0
210
2026年もソフトウェアサプライチェーンのリスクに立ち向かうために / Product Security Square #3
Avatar for GMO Flatt Security flatt_security
1
720
生成AI活用でQAエンジニアにどのような仕事が生まれるか/Support Required of QA Engineers for Generative AI
Avatar for Hiroki Iseri goyoki
1
340
"作る"から"使われる"へ：Backstage 活用の現在地
Avatar for SoftBank Tech Night sbtechnight
0
230

Featured

See All Featured
Avoiding the “Bad Training, Faster” Trap in the Age of AI
Avatar for Mike Taylor tmiket
0
100
Skip the Path - Find Your Career Trail
Avatar for Mark Kilby mkilby
1
87
Noah Learner - AI + Me: how we built a GSC Bulk Export data pipeline
Avatar for Tech SEO Connect techseoconnect
PRO
0
140
Fireside Chat
Avatar for paigeccino paigeccino
42
3.8k
Navigating the Design Leadership Dip - Product Design Week Design Leaders+ Conference 2024
Avatar for Andy Polaine apolaine
0
240
[RailsConf 2023] Rails as a piece of cake
Avatar for Vladimir Dementyev palkan
59
6.4k
Paper Plane
Avatar for Katie Cordina Lindsey katiecoart
PRO
0
48k
Stop Working from a Prison Cell
Avatar for Chris Michel hatefulcrawdad
274
21k
Code Review Best Practice
Avatar for Trisha Gee trishagee
74
20k
DBのスキルで生き残る技術 - AI時代におけるテーブル設計の勘所
Avatar for soudai sone soudai
PRO
64
52k
Leveraging LLMs for student feedback in introductory data science courses - posit::conf(2025)
Avatar for Mine Cetinkaya-Rundel minecr
1
200
Building AI with AI
Avatar for Ines Montani inesmontani
PRO
1
810

Transcript

  1. CPython's bug in feature that nobody uses Chiu-Hsiang Hsu [email protected]

  2. nickname : dv (currently) undergraduate student

  3. CPython the de-facto reference Python implementation

  4. tarfile module to r/w tar archives include those using gzip,

    bz2, lzma compression

  5. tarfile module add CLI since Python 3.4

  6. It’s similar to “tar” command in Unix-like system

  7. Comparison tarfile module python -m tarfile -c files.tar files/ python

    -m tarfile -c files.tar.gz files/ python -m tarfile -c files.tar.bz2 files/ python -m tarfile -c files.tar.xz files/ tar command tar cf files.tar files/ tar zcf files.tar.gz files/ tar jcf files.tar.bz2 files/ tar Jcf files.tar.xz files/

  8. tarfile module can choose compression algorithm automatically, but tar command

    can’t

  9. seems a little bit smarter ?

  10. But

  11. It’s broken :(

  12. It won’t use any compression algorithm !!! ? ? ?

  13. None

  14. tarfile.py with bug without bug

  15. tarfile.py with bug without bug

  16. I hate (love) those dot

  17. fix in CPython 3.4.4 and 3.5

  18. fix in CPython 3.4.4 and 3.5 but who cares this

    feature XD ?