Details about the `async def` syntax for *path operation functions* and some background about asynchronous code, concurrency, and parallelism.

## In a hurry? { #in-a-hurry }

<abbr title="too long; didn't read"><strong>TL;DR:</strong></abbr>

If you are using third party libraries that tell you to call them with `await`, like:

```Python
results = await some_library()
```

# 並行処理と async / await

*path operation 関数*のための `async def` に関する詳細と非同期 (asynchronous) コード、並行処理 (Concurrency)、そして、並列処理 (Parallelism) の背景について。

## 急いでいますか？

<abbr title="too long; didn't read (長すぎて読めない人のための要約という意味のスラング)"><strong>TL;DR:</strong></abbr>

次のような、`await` を使用して呼び出すべきサードパーティライブラリを使用している場合:

```Python
results = await some_library()
```

以下の様に `async def` を使用して*path operation 関数*を宣言します。

```Python hl_lines="2"
@app.get('/')

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ju[nl]\.?|aug\.?|sep\.?|okt\.?|nov\.?|dec\.?)/i;M.defineLocale("nl",{months:"januari_februari_maart_april_mei_juni_juli_augustus_september_oktober_november_december".split("_"),monthsShort:function(e,a){return e?/-MMM-/.test(a)?ir[e.month()]:dr[e.month()]:dr},monthsRegex:or,monthsShortRegex:or,monthsStrictRegex:/^(januari|februari|maart|april|mei|ju[nl]i|augustus|september|oktober|november|december)/i,monthsShortStrictRegex:/^(jan\.?|feb\.?|mrt\.?|apr\.?|mei|ju[nl]\.?|aug\.?|sep\.?|okt\.?|nov\.?...

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// government institutions.
in
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yption-Iv":"4ScYszyJZ+rJS32bo5bJj9P4du4oLd=","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id":"my-minio-key","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key":"IAAfAPuoV10citOErN3z/twhhZt9g7u5kDjUtnbdP/oJJP1O0K6A/xhpqCwIuZ5C7Hqca4a+DR+ZkFg==","X-Minio-Internal-Server-Side-Encryption-S3-Sealed-Key":"IAAfAKaTCNFFhuXBwmop/lH2EoRvstrYjkGv8PekV+fg2B69wyebKTioLiug==","X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm":"DAREv2-HMAC-SHA256","content-type":"application/octet-stream"...

F7xYM,YAAA,MApBN,2CtFszYA,6CsF9xYM,MAAA,OAxBN,sCA8BM,QAAA,MtFmyYN,gDADA,kDADA,0CsF/zYA,4CC3DE,kBAAA,eAAA,UAAA,eD2DF,uBA8CI,cAAA,EA9CJ,iCAiDM,YAAA,OACA,UAAA,OACA,aAAA,MACA,WAAA,OACA,MAAA,OArDN,oCAAA,qCAAA,qCAAA,qCAAA,qCAAA,qCAAA,qCAAA,gDA+DQ,UAAA,OA/DR,oCAoEM,WAAA,IApEN,2BA0EI,QAAA,KACA,WAAA,KACA,QAAA,EA5EJ,yDAiFU,MAAA,OAjFV,4CAyFM,WAAA,QAAA,IAAA,YACA,aAAA,KAEA,qDACE,aAAA,MA7FR,qEAoGU,aAAA,KACA,YAAA,MAEA,8EACE,aAAA,KACA,YAAA,OAzGZ,yBAiHI,UAAA,MACA,QAAA,MAAA,OAlHJ,yBAsHI,QAAA,OACA,OAAA,EACA,YAAA,O...