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Our journey to type checking 4 million lines of Python
Dropbox is a big user of Python. It’s our most widely used language both for backend services and the desktop client app (we are also heavy users of Go, TypeScript, and Rust). At our scale—millions of lines of Python—the dynamic typing in Python made code needlessly hard to understand and started to seriously impact productivity. To mitigate this, we have been gradually migrating our code to stati
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大è¦æ¨¡ãªã‚³ãƒ¼ãƒ‰ãƒ™ãƒ¼ã‚¹ã«ãŠã‘る型アノテーションã®é€£æº monkeytype 㨠PyAnnotateã®æ¯”較 タイトル：Type annotations with larger codebases 発表者：Stephan Jaensch セッション動画 本記事ã®æœ€å¾Œã«ç´¹ä»‹ã™ã‚‹ã®ã¯ã€yelpã®ãƒãƒƒã‚¯ã‚¨ãƒ³ãƒ‰ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã«ã‚ˆã‚‹åž‹ã‚¢ãƒŽãƒ†ãƒ¼ã‚·ãƒ§ãƒ³ã«é–¢ã™ã‚‹ç™ºè¡¨ã§ã™ã€‚ 型アノテーションãŠã‚ˆã³åž‹ãƒ’ントã«é–¢ã™ã‚‹ç™ºè¡¨ã¯ã€PyCon JPã§ã‚‚毎年発表ãŒè¡Œã‚ã‚Œã¦ã„ã¾ã™ã€‚ 型ヒントã«ã¤ã„ã¦è€ƒãˆã‚ˆã†! - PyCon JP 2016 ベンリã«ä½¿ãŠã†å¤‰æ•°ã‚¢ãƒŽãƒ†ãƒ¼ã‚·ãƒ§ãƒ³ - typing.pyã¨ã®æ¥½ã—ã„ãŠä»˜ãåˆã„ - PyCon JP 2017 ç†è€…ã‚‚ã“れらã®ç™ºè¡¨ã‚’èžã„ã¦ã„ãŸã®ã§ã™ãŒã€ã©ã¡ã‚‰ã‚‚型アノテーション・型ヒントã«é–¢é€£ã™ã‚‹PEP（Python Enhancement Proposal）を紹介ã—ã€ä»•æ§˜ã‚„型ヒントã®æ›¸ãæ–¹ã«ã¤
Type hints cheat sheet (Python 3) — Mypy 0.910 documentation
Type hints cheat sheet¶ This document is a quick cheat sheet showing how to use type annotations for various common types in Python. Variables¶ Technically many of the type annotations shown below are redundant, since mypy can usually infer the type of a variable from its value. See Type inference and type annotations for more details. # This is how you declare the type of a variable age: int = 1
A Python static typing update [LWN.net]
One of the larger features added to Python over the last few releases is support for static typing in the language. Static type-checking and tools to support it show up frequently as topics at the Python Language Summit (PLS) and this year was no exception. Mypy developers Jukka Lehtosalo and Ivan Levkivskyi gave an update on static typing at PLS 2018. Lehtosalo started things off by talking about
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2. 自己紹介 ◠森本 哲也 – twitter: @t2y â— ãƒãƒ¼ã‚¿ãƒ«ã‚µã‚¤ãƒˆã®ä¼šç¤¾ – オブジェクトストレージã®é–‹ç™ºãƒ»é‹ç”¨ â— æ¥å‹™ã§ã¯ Go 言語ã§é–‹ç™º – 普段使ã„ã®ãƒ„ールやプãƒãƒˆã‚¿ã‚¤ãƒ”ング㫠Python ◠エã‚スパート Python プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°æ”¹è¨‚２版 – Python 3.5 ( 翻訳㯠3.6) を対象 3. 最近ã®ãƒ‹ãƒ¥ãƒ¼ã‚¹ â— Pyre: Fast Type Checking for Python – 概è¦ã‹ã‚‰å¼•ç”¨ Facebook 社も Instagram 社も大è¦æ¨¡ã« Python を使ã£ã¦ã„ã¾ã™ã€‚ç§ãŸã¡ã¯ Python ã®è¡¨ç¾åŠ›ã€ 柔軟性ã€é–‹ç™ºã«ãŠã‘る生産性をã¨ã¦ã‚‚好んã§ã„ã¾ã™ã€‚ã—ã‹ã—ã€æ•°ç™¾ä¸‡è¡Œã¨ã„ã£ãŸå¤§è¦æ¨¡ã‚³ãƒ¼ãƒ‰ ベースã®ä¿å®ˆã‚’考ãˆã‚‹ã¨ã€ãã†ã„ã£ãŸè‰¯ã„ã¨ã“ã‚ã«ã‚‚é™°ã‚ŠãŒã¿ãˆã¦ãã¾ã™ã€‚ â— é™çš„ãªä¿è¨¼ãŒãªã„ã¨ã€æ—¢å˜ã®ã‚³ãƒ¼ãƒ‰ãƒ™ãƒ¼ã‚¹ã‚’安全ã«å¤‰æ›´ã™ã‚‹ã“ã¨ãŒé›£ã—ããªã‚Š
Generics - mypy 1.8.0+dev.544e6ce119ec6bdd5eabab53a433264c98dc7d9c.dirty documentation
mypy 1.8.0+dev.544e6ce119ec6bdd5eabab53a433264c98dc7d9c.dirty documentation
Sphinx ã« mypy ã® type annotation ã‚’å°Žå…¥ã—ãŸè©± - Hack like a rolling stone
今年ã¯ã‚¢ãƒ‰ãƒ™ãƒ³ãƒˆã‚«ãƒ¬ãƒ³ãƒ€ãƒ¼ã«ã‚‚å‚åŠ ã—ã¦ã„ãªã„ã—ã€ã“ãŸã¤ã«å…¥ã£ã¦ã らã らéŽã”ãã†ã‹ã¨æ€ã£ã¦ã„ãŸã‚‰ã€ãªã‚“ã‹æ›¸ã‘ã¨ç…½ã‚‰ã‚Œã¾ã—ãŸã€‚年末ã§ã™ã。 @tk0miya qiita ã®è¨˜äº‹ã¾ã ー？— Tetsuya Morimoto (@t2y) 2016å¹´12月25æ—¥ 何を書ã“ã†ã‹æ€è€ƒã‚’ã‚ãらã—ãŸçµæžœã€mypy ã‚’ Sphinx ã«å°Žå…¥ã—ãŸè©±ã§ã‚‚書ãã“ã¨ã«ã—ã¾ã™ã€‚ mypy ã«ã¤ã„ã¦ã¯ @t2y 㮠紹介記事 ã€ç¿»è¨³è¨˜äº‹ãŒéžå¸¸ã«å‚考ã«ãªã‚Šã¾ã—ãŸã€‚ ã§ã™ã®ã§ã€ã“ã®è¨˜äº‹ã¯ @t2y ã¸ã®ã‚¢ãƒ³ã‚µãƒ¼ã‚½ãƒ³ã‚°ã§ã™ã€‚ ãªãŠã€ã€Œå°Žå…¥ã—ãŸè©±ã€ã¨å付ã‘ã¦ã¯ã¿ãŸã‚‚ã®ã®ã€ã¾ã 100% 対応ã—ãŸã¨ã„ã†ã‚ã‘ã§ã¯ãªã„ã®ã§ã€è©¦è¡ŒéŒ¯èª¤ã®æ§˜åã¨æ„šç—´ã‚’書ãç•™ã‚ã¦ã„ãã¾ã™ã€‚ Sphinx ã« type annotation ã‚’ã¤ã‘ã¦ã¿ãŸ Sphinx ã§ã¯ç¾åœ¨ã€ master ブランãƒã«å¯¾ã—㦠type annotation ãŒã¤ã‘られã¦ã„
The mypy command line - mypy 1.11.2 documentation
Note that directories are checked recursively. Mypy also lets you specify what code to type check in several other ways. A short summary of the relevant flags is included below: for full details, see Running mypy and managing imports. -m MODULE, --module MODULE¶ Asks mypy to type check the provided module. This flag may be repeated multiple times. Mypy will not recursively type check any submodule
mypyã‚„ã£ã¦ã„ããž - Qiita
$ mypy test.py test.py: note: In function "func": test.py:2: error: Incompatible return value type (got "str", expected "int") アノテーションを元ã«åž‹ã‚’ãƒã‚§ãƒƒã‚¯ã—ã¦ã€æˆ»ã‚Šå€¤ã®åž‹ãŒintãªã®ã«strã‚’è¿”ã—ã¦ã„ã‚‹ã®ã§ã‚¨ãƒ©ãƒ¼ã«ãªã‚Šã¾ã™ã€‚ ã‚„ã£ã¦ã„ãæ°—æŒã¡ "mypyã‚„ã£ã¦ã„ã"ã¨ã„ã†ã®ã¯ã€PEP 484ã«å¯¾å¿œã—ãŸåž‹ã‚¢ãƒŽãƒ†ãƒ¼ã‚·ãƒ§ãƒ³ã‚’付ã‘ã€mypyを実行ã—é™çš„ãƒã‚§ãƒƒã‚¯ã‚’パスã™ã‚‹ã“ã¨ã‚’指ã—ã¾ã™ã€‚ãªãœã‚„ã£ã¦ã„ãæ°—æŒã¡ã«ãªã£ãŸã‹ã¨ã„ã†ã¨ã€Static types in Python, oh my(py)! ã“ã®è¨˜äº‹ã‚’èªã‚“ã ã“ã¨ãŒå¤§ãã„ã§ã™ã€‚ã‚„ã£ã¦ã„ã‘ãã†ãªæ°—ãŒã—ã¾ã—ãŸã€‚担当ã—ã¦ã„る案件ãŒè¦æ¨¡ãŒå¤§ããæ—¢å˜æ©Ÿèƒ½ã®å¤‰æ›´é »åº¦ã‚‚高ã„ã‚‚ã®ã ã£ãŸã®ã§ã€ä¿¡é ¼ã§ãる型アノテーションãŒæœ‰ã‚‹ã¨ã€ä¿®æ£ã™ã‚‹
型ヒントãŒæä¾›ã•ã‚Œã¦ã„ãªã„pythonライブラリã«mypy用ã«åž‹ãƒ’ントを入れる - Keep on moving
最近mypyを趣味ã§ä½¿ã„始ã‚ãŸã®ã§ã„ã‚ã„ã‚書ã“ã†ã¨æ€ã„ã¾ã™ã€‚ @tk0miiyka ã•ã‚“ã®è¨˜äº‹ã‚’èªã‚“ã§ã¨ã‚Šã‚ãˆãšè‡ªåˆ†ã®ä»•äº‹ã§mypy使ãˆãã†ãªã¨ã“ã‚ã‚’ã„ã‚ã„ã‚考ãˆã¦ã¿ãŸ 対象ãƒãƒ¼ã‚¸ãƒ§ãƒ³ version python 3.5.2 mypy 0.4.6 last update 2017.01.08 TL;DR pyiファイルをã¤ãã‚Œã°ä¸–ã®ä¸ã®åž‹ãƒ’ントãŒæä¾›ã•ã‚Œã¦ã„ãªã„プãƒã‚¸ã‚§ã‚¯ãƒˆã«åž‹ãƒ’ントをã¤ã‘られる。 ã¾ãƒ¼ã§ã‚‚çµæ§‹ã‚ã‚“ã©ã„ã®ã§ã€ã¿ã‚“ãªã§typeshedを育ã¦ã¦ã„ãã®ãŒã‚ˆã•ãã†ã§ã™ã€‚ GitHub - python/typeshed: Collection of library stubs for Python, with static types mypyã£ã¦ï¼Ÿ ã“ã¡ã‚‰ã®ç´ 晴らã—ã„記事をèªã‚“ã ã»ã†ãŒã„ã„ã§ã™ã。 qiita.com è¦ã¯Python3.4以é™ã§ä½¿ãˆã‚‹é™çš„åž‹ãƒã‚§ãƒƒã‚«ãƒ¼ã‚‰ã—ã„。個
[翻訳] PEP 0484 -- 型ヒント (Type Hints) - Qiita
ã“れらã®ã‚¢ãƒŽãƒ†ãƒ¼ã‚·ãƒ§ãƒ³ã¯å®Ÿè¡Œæ™‚ã«æ™®é€šã® __annotations__ 属性ã¨ã—ã¦å‚ç…§ã§ãる一方ã§ã€ 実行時ã«ã¯åž‹ãƒã‚§ãƒƒã‚¯ã‚’è¡Œã„ã¾ã›ã‚“ 。ãã®ä»£ã‚ã‚Šã€ã“ã®æ案ã¯ç‹¬ç«‹ã—ãŸã‚ªãƒ•ãƒ©ã‚¤ãƒ³åž‹ãƒã‚§ãƒƒã‚«ãƒ¼ã®å˜åœ¨ã‚’仮定ã—ã¦ã„ã¾ã™ã€‚ユーザーã¯ãã®ã‚ˆã†ãªåž‹ãƒã‚§ãƒƒã‚«ãƒ¼ã‚’使ã£ã¦è‡ªä¸»çš„ã«ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’検査ã§ãã¾ã™ã€‚基本的ã«ã“ã†ã„ã£ãŸåž‹ãƒã‚§ãƒƒã‚«ãƒ¼ã¯éžå¸¸ã«å¼·åŠ›ãªãƒªãƒ³ã‚¿ãƒ¼ (linter) ã¨ã—ã¦æ©Ÿèƒ½ã—ã¾ã™ã€‚(ã‚‚ã¡ã‚ã‚“ä¼¼ãŸã‚ˆã†ãªãƒã‚§ãƒƒã‚«ãƒ¼ã‚’使ã£ã¦å€‹ã€…ã®ãƒ¦ãƒ¼ã‚¶ãƒ¼å‘ã‘ã«å¥‘ç´„ã«ã‚ˆã‚‹è¨è¨ˆ (Design By Contract) ã®å¼·åˆ¶ã‚„ JIT 最é©åŒ–を実行時ã«è¡Œã†ã“ã¨ã‚‚ã§ãã‚‹ã¯ãšã§ã™ãŒã€ãã†ã„ã£ãŸãƒ„ールã¯ã¾ã 実用レベルã«ã¯ãªã£ã¦ã„ã¾ã›ã‚“。) ã“ã®æ案㯠mypy [mypy] ã«å¼·ã触発ã•ã‚Œã¦ã„ã¾ã™ã€‚例ãˆã°ã€"æ•´æ•°åž‹ã®ã‚·ãƒ¼ã‚±ãƒ³ã‚¹" ã®åž‹ã¯ Sequence[int] ã®ã‚ˆã†ã«è¨˜è¿°ã—ã¾ã™ã€‚角括弧を使ã†ã“ã¨ã§è¨€èªžã«æ–°ã—ã„構文を追
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Mypy 0.520 Released
Updates about mypy, an optional static type checker for Python We’ve just uploaded mypy 0.520 to PyPI. This release includes new features, bug fixes and library stub (typeshed) updates. You can install it as follows: python3 -m pip install --upgrade mypy We are always happy to answer questions on Gitter — note that we’ve moved to a new channel, python/typing. Major New Features Fine-grained Contro
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[翻訳] Python ã®é™çš„åž‹ã€ã™ã”ã„ mypy! - Qiita
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Python's Mypy: Callables and Generators | Linux Journal
Type for classes expecting a certain generic parameter · Issue #7791 · python/mypy
mypy - Examples
Mypy 0.610 released
Search - mypy 1.14.0+dev.e106dd7a0653c24d67597adf3ae6939d7ff9a376 documentation
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