## `PATH`環境変数

**`PATH`**という**特別な**環境変数があります。この環境変数は、OS（Linux、macOS、Windows）が実行するプログラムを発見するために使用されます。

`PATH`変数は、複数のディレクトリのパスから成る長い文字列です。このパスはLinuxやMacOSの場合は`:`で、Windowsの場合は`;`で区切られています。

例えば、`PATH`環境変数は次のような文字列かもしれません:

//// tab | Linux, macOS

```plaintext
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

    val c = this[i]
    if (c == '%' || c == '+' && plusIsSpace) {
      // Slow path: the character at i requires decoding!
      val out = Buffer()
      out.writeUtf8(this, pos, i)
      out.writePercentDecoded(this, pos = i, limit = limit, plusIsSpace = plusIsSpace)
      return out.readUtf8()
    }
  }

  // Fast path: no characters in [pos..limit) required decoding.
  return substring(pos, limit)
}

/// tip | 豆知識

使用するすべてのタグにメタデータを追加する必要はありません。

///

### 自作タグの使用

`tags` パラメーターを使用して、それぞれの *path operations* (および `APIRouter`) を異なるタグに割り当てます:

{* ../../docs_src/metadata/tutorial004.py hl[21,26] *}

/// info | 情報

タグのより詳しい説明を知りたい場合は [Path Operation Configuration](path-operation-configuration.md#tags){.internal-link target=_blank} を参照して下さい。

///

### ドキュメントの確認

But remember that when you import `Query`, `Path`, `File` and others from `fastapi`, those are actually functions that return special classes.

///

/// tip

To declare File bodies, you need to use `File`, because otherwise the parameters would be interpreted as query parameters or body (JSON) parameters.

///

The files will be uploaded as "form data".

                plugin = pluginData.getDelegate();
            }
            trace = trace.getParent();
        }

        Path trackingDir;
        boolean missing = event.getFile() == null;
        if (missing) {
            // missing artifact - let's track the path anyway
            File dir = event.getSession().getLocalRepository().getBasedir();
            dir = new File(

    assert response.status_code == 200, response.text
    assert response.json() == snapshot(
        {
            "openapi": "3.1.0",
            "info": {"title": "FastAPI", "version": "0.1.0"},
            "paths": {
                "/user/": {
                    "post": {
                        "summary": "Create User",
                        "operationId": "create_user_user__post",
                        "requestBody": {

    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/users/me": {
                "get": {
                    "responses": {
                        "200": {
                            "description": "Successful Response",

    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/items/": {
                "get": {
                    "summary": "Read Items",
                    "operationId": "read_items_items__get",
                    "responses": {

          ExampleStackTrace path = new ExampleStackTrace(preAcquiredLock, this);
          path.setStackTrace(entry.getValue().getStackTrace());
          path.initCause(found);
          return path;
        }
      }
      return null;
    }
  }

  /**
   * CycleDetectingLock implementations must call this method before attempting to acquire the lock.
   */

import okhttp3.internal.publicsuffix.ResourcePublicSuffixList.Companion.PUBLIC_SUFFIX_RESOURCE
import okio.BufferedSink
import okio.ByteString
import okio.ByteString.Companion.encodeUtf8
import okio.FileSystem
import okio.Path
import okio.Path.Companion.toPath
import okio.buffer

/**
 * Downloads the public suffix list from https://publicsuffix.org/list/public_suffix_list.dat and
 * transforms the file into an efficient format used by OkHttp.
 *
 *