Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Python Type Hinting and Static Type Checking
Search
ChangHui Lee
August 17, 2019
Programming
0
1.6k
Python Type Hinting and Static Type Checking
ChangHui Lee
August 17, 2019
Tweet
Share
More Decks by ChangHui Lee
See All by ChangHui Lee
RegExp 101
blur
0
220
Other Decks in Programming
See All in Programming
Go Conference 2025: Goで体感するMultipath TCP ― Go 1.24 時代の MPTCP Listener を理解する
takehaya
7
1.5k
Swift Concurrency - 状態監視の罠
objectiveaudio
2
420
iOSエンジニア向けの英語学習アプリを作る!
yukawashouhei
0
170
PostgreSQLで手軽にDuckDBを使う!DuckDB&pg_duckdb入門/osk2025-duckdb
takahashiikki
1
230
CSC305 Lecture 04
javiergs
PRO
0
230
dynamic!
moro
9
5.5k
Swiftビルド弾丸ツアー - Swift Buildが作る新しいエコシステム
giginet
PRO
0
1.6k
CSC305 Lecture 01
javiergs
PRO
1
380
10年もののAPIサーバーにおけるCI/CDの改善の奮闘
mbook
0
690
monorepo の Go テストをはやくした〜い!~最小の依存解決への道のり~ / faster-testing-of-monorepos
convto
2
130
WebエンジニアがSwiftをブラウザで動かすプレイグラウンドを作ってみた
ohmori_yusuke
0
170
Build your own WebP codec in Swift
kishikawakatsumi
2
870
Featured
See All Featured
Fireside Chat
paigeccino
40
3.7k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3.1k
Stop Working from a Prison Cell
hatefulcrawdad
271
21k
Raft: Consensus for Rubyists
vanstee
139
7.1k
Balancing Empowerment & Direction
lara
4
670
Rebuilding a faster, lazier Slack
samanthasiow
84
9.2k
Six Lessons from altMBA
skipperchong
28
4k
Done Done
chrislema
185
16k
How To Stay Up To Date on Web Technology
chriscoyier
791
250k
What's in a price? How to price your products and services
michaelherold
246
12k
Designing for Performance
lara
610
69k
Learning to Love Humans: Emotional Interface Design
aarron
274
40k
Transcript
PyCon Korea 2019 ఋੑ Ѩࢎ۽ ؊ ա Python ٘
ࢿೞӝ ହ൞
ߊ blurfx • ࣽୌೱҮ (2014 ~ ) • ֏टܻই (2018.03
~ 2019.07) • ೖಎ٘ஹಌפ (2019.07 ~ )
ॆਸ फযೞח ࢎۈٜ ॆਸ ৵ फযೡөਃ?
None
ఋੑ য ز ఋੑ য
ఋੑ য Writing Code Build Test Run/Deploy য়ܨܳ ߊѼೞח
ҳр
ز ఋੑ য Writing Code Test Run/Deploy য়ܨܳ ߊѼೞח ҳр
ఋੑ Ѩࢎо ޖҊ ೞݶ ޖ જইաਃ?
۽ંо ਵݶ ѐߊ ࣻب Ҋ, ߡӒ ࣻب ݅ icons from
https://icons8.com
۽ંо ਵݶ ѐߊ ࣻب Ҋ, ߡӒ ࣻب ݅ icons from
https://icons8.com ۽ંо ழҊ ѐߊо ݆ইݶ Ӓ ݅ఀ ߡӒب ݆ইפ
۽ંо ਵݶ ѐߊ ࣻب Ҋ, ߡӒ ࣻب ݅ icons from
https://icons8.com ۽ંо ழҊ ѐߊо ݆ইݶ Ӓ ݅ఀ ߡӒب ݆ইפ ز ఋੑ য۽ ࢿೠ ٘ח ۽ંо ழࣻ۾ п ёо যڃ чਸ ঌҊ ח ൨ٜযפ var x ... x ?
Writing Code Static Type Checking Test Run/Deploy ఋੑ ۽
ఋੑী য়ܨо ח Ѩࢎ
٘ оةࢿ ৢۄоҊ ఋੑਵ۽ ߊࢤೡ ࣻ ח ߡӒܳ ߑ೧ਃ
٘ оةࢿ ৢۄоҊ ఋੑਵ۽ ߊࢤೡ ࣻ ח ߡӒܳ ߑ೧ਃ
To Type or Not to Type: Quantifying Detectable Bugs in
JavaScript http://earlbarr.com/publications/typestudy.pdf
http://earlbarr.com/publications/typestudy.pdf To Type or Not to Type
Conclusion: we found that using Flow or TypeScript could have
prevented 15% of the public bugs for public projects on GitHub. http://earlbarr.com/publications/typestudy.pdf To Type or Not to Type
Conclusion: we found that using Flow or TypeScript could have
prevented 15% of the public bugs for public projects on GitHub. http://earlbarr.com/publications/typestudy.pdf To Type or Not to Type
ॆ ز ఋੑ যੋؘ ఋੑਸ যڌѱ ਃ?
Function Annotation Type Annotation Variable Annotation Python 3.0+ Python 3.5+
Python 3.6+
Python 3.6+
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
• ࣻ৬ ޙৌ݅ ೲਊೞח ܻझ • ޙৌ, पࣻ, ࠗ ࣽࢲ۽
ػ ౚ • ޙৌ ః৬ ߄ чਸ о ٤࣊ցܻ • ઁ֎ܼ ೣࣻ৬ ېझ ఋੑ ൦
https://imgflip.com/i/186jmm
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
TypeError: Too many parameters for typing.List; actual 2, expected 1
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
ఋੑ ൦
None
ఋੑ ൦
ఋੑ ൦
None
None
http://blog.daum.net/junjungirl/109
“ no type checking happens at runtime ” — PEP
484
None
mypy mypy ࢸೞӝ
mypy ఋੑ Ѩࢎೞӝ
mypy ఋੑ Ѩࢎೞӝ
mypy ఋੑ Ѩࢎೞӝ
None
Incompatible types in assignment (expression has type "str", variable has
type "int") List item 1 has incompatible type "int"; expected "str" List item 2 has incompatible type "float"; expected "str" Argument 1 to "append" of "list" has incompatible type "bytes"; expected "str"
mypy
mypy
mypy
mypy.readthedocs.io ؊ ࣁೠ ղਊ...
github.com/python/mypy
Q & A
хࢎפ
[email protected]