func newContext(r *http.Request, w http.ResponseWriter, api string) context.Context {
	reqID := w.Header().Get(xhttp.AmzRequestID)

	vars := mux.Vars(r)
	bucket := vars["bucket"]
	object := likelyUnescapeGeneric(vars["object"], url.PathUnescape)
	reqInfo := &logger.ReqInfo{
		DeploymentID: globalDeploymentID(),
		RequestID:    reqID,
		RemoteHost:   handlers.GetSourceIP(r),

   * have the provided key, an empty collection is returned.
   *
   * <p>Changes to the returned collection will update the underlying multimap, and vice versa.
   *
   * <p>Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
   * returns a {@link SortedSet}, instead of the {@link Collection} specified in the {@link
   * Multimap} interface.

	}

	references := make([]interface{}, 0, len(constraint.References))
	for _, field := range constraint.References {
		references = append(references, clause.Column{Name: field.DBName})
	}
	vars = append(vars, clause.Table{Name: constraint.Name}, foreignKeys, clause.Table{Name: constraint.ReferenceSchema.Table}, references)
	return
}

func (rel *Relationship) ParseConstraint() *Constraint {

///

環境変数（「**env var**」とも呼ばれます）とは、Pythonコードの**外側**、つまり**オペレーティングシステム**に存在する変数で、Pythonコード（または他のプログラム）から読み取れます。

環境変数は、アプリケーションの**設定**の扱い、Pythonの**インストール**の一部などで役立ちます。

## 環境変数の作成と使用 { #create-and-use-env-vars }

環境変数は、Pythonを必要とせず、**シェル（ターミナル）**で**作成**して使用できます。

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// 環境変数 MY_NAME を作成する例
$ export MY_NAME="Wade Wilson"

     * clone. The only requirement is that invocations of {@link #addRepository(Repository)} on the clone do not affect
     * the state of the original resolver and vice versa.
     *
     * @return The cloned resolver, never {@code null}.
     */
    ModelResolver newCopy();

   * have the provided key, an empty collection is returned.
   *
   * <p>Changes to the returned collection will update the underlying multimap, and vice versa.
   *
   * <p>Because a {@code SortedSetMultimap} has unique sorted values for a given key, this method
   * returns a {@link SortedSet}, instead of the {@link java.util.Collection} specified in the

如果你已經知道什麼是「環境變數」並且知道如何使用它們，你可以放心跳過這一部分。

///

環境變數（也稱為「**env var**」）是一個獨立於 Python 程式碼**之外**的變數，它存在於**作業系統**中，可以被你的 Python 程式碼（或其他程式）讀取。

環境變數對於處理應用程式**設定**（作為 Python **安裝**的一部分等方面）非常有用。

## 建立和使用環境變數 { #create-and-use-env-vars }

你在 **shell（終端機）**中就可以**建立**和使用環境變數，並不需要用到 Python：

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// 你可以使用以下指令建立一個名為 MY_NAME 的環境變數
$ export MY_NAME="Wade Wilson"

1F75          ; mapped                 ; 03AE          # 1.1  GREEK SMALL LETTER ETA WITH OXIA
1F76          ; valid                                  # 1.1  GREEK SMALL LETTER IOTA WITH VARIA
1F77          ; mapped                 ; 03AF          # 1.1  GREEK SMALL LETTER IOTA WITH OXIA
1F78          ; valid                                  # 1.1  GREEK SMALL LETTER OMICRON WITH VARIA

///

### Pydantic v1 e v2 na mesma aplicação { #pydantic-v1-and-v2-on-the-same-app }

Não é **suportado** pelo Pydantic ter um modelo do Pydantic v2 com campos próprios definidos como modelos do Pydantic v1, ou vice-versa.

```mermaid
graph TB
    subgraph "❌ Not Supported"
        direction TB
        subgraph V2["Pydantic v2 Model"]
            V1Field["Pydantic v1 Model"]
        end
        subgraph V1["Pydantic v1 Model"]

   *       instances.
   *   <li>For the constructor or static factory method used to construct instances, it's checked
   *       that when equal parameters are passed, the result instance should also be equal; and vice
   *       versa.
   *   <li>If a non-private constructor or non-private static factory method exists:
   *       <ul>
   *         <li>Test will fail if default value for a parameter cannot be determined.