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   Licensed under the Apache License, Version 2.0 (the "License");

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pkg go/parser, type Mode uint
pkg go/printer, const RawFormat Mode
pkg go/printer, const SourcePos Mode
pkg go/printer, const TabIndent Mode
pkg go/printer, const UseSpaces Mode
pkg go/printer, func Fprint(io.Writer, *token.FileSet, interface{}) error
pkg go/printer, method (*Config) Fprint(io.Writer, *token.FileSet, interface{}) error
pkg go/printer, type CommentedNode struct

{* ../../docs_src/handling_errors/tutorial006.py hl[2:5,15,21] *}

```Python
with open("./somefile.txt") as f:
    contents = f.read()
    print(contents)
```

その後の`open("./somefile.txt")`は「コンテキストマネージャ」と呼ばれるオブジェクトを作成します。

`with`ブロックが終了すると、例外があったとしてもファイルを確かに閉じます。

`yield`を依存関係を作成すると、**FastAPI** は内部的にそれをコンテキストマネージャに変換し、他の関連ツールと組み合わせます。