（FastAPI を使わない場合でも）Python の型の使い方を 2 分で復習したい場合は、短いチュートリアル [Python の型](python-types.md) を参照してください。

型を使った標準的な Python を記述します:

```Python
from datetime import date

from pydantic import BaseModel

# Declare a variable as a str
# and get editor support inside the function
def main(user_id: str):
    return user_id


# A Pydantic model
class User(BaseModel):
    id: int
    name: str
    joined: date
```

{* ../../docs_src/query_params_str_validations/tutorial013_an_py310.py hl[9] *}

/// note | 注意

注意，在這種情況下，FastAPI 不會檢查清單的內容。

例如，`list[int]` 會檢查（並文件化）清單內容為整數；但單獨使用 `list` 則不會。

///

## 宣告更多中繼資料 { #declare-more-metadata }

你可以為參數加入更多資訊。

這些資訊會被包含在產生的 OpenAPI 中，供文件 UI 與外部工具使用。

/// note | 注意

請留意，不同工具對 OpenAPI 的支援程度可能不同。

有些工具可能暫時還不會顯示所有額外資訊；不過多半這些缺漏功能已在開發規劃中。

///

					f.Preamble += commentText(cg) + "\n"
					f.Preamble += "#line 1 \"cgo-generated-wrapper\"\n"
				}
			}

		case *ast.FuncDecl:
			// Also, reject attempts to declare methods on C.T or *C.T.
			// (The generated code would otherwise accept this
			// invalid input; see issue #57926.)
			if decl.Recv != nil && len(decl.Recv.List) > 0 {
				recvType := decl.Recv.List[0].Type

///

### Installer des packages directement { #install-packages-directly }

Si vous êtes pressé et ne souhaitez pas utiliser un fichier pour déclarer les dépendances de votre projet, vous pouvez les installer directement.

/// tip | Astuce

        ? EMPTY
        : new ImmutableDoubleArray(array, start + startIndex, start + endIndex);
  }

  @IgnoreJRERequirement // used only from APIs that use streams
  /*
   * We declare this as package-private, rather than private, to avoid generating a synthetic
   * accessor method (under -target 8) that would lack the Android flavor's @IgnoreJRERequirement.
   */
  Spliterator.OfDouble spliterator() {

    return startIndex == endIndex
        ? EMPTY
        : new ImmutableIntArray(array, start + startIndex, start + endIndex);
  }

  @IgnoreJRERequirement // used only from APIs that use streams
  /*
   * We declare this as package-private, rather than private, to avoid generating a synthetic
   * accessor method (under -target 8) that would lack the Android flavor's @IgnoreJRERequirement.
   */
  Spliterator.OfInt spliterator() {

    StringBuilder sb = new StringBuilder(16);
    lowerBound.describeAsLowerBound(sb);
    sb.append("..");
    upperBound.describeAsUpperBound(sb);
    return sb.toString();
  }

  // We declare accessors so that we can use method references like `Range::lowerBound`.

  Cut<C> lowerBound() {
    return lowerBound;
  }

  Cut<C> upperBound() {
    return upperBound;
  }

If you need to upgrade a version or add a new package you would **do this again**.

///

### Install Packages Directly { #install-packages-directly }

If you're in a hurry and don't want to use a file to declare your project's package requirements, you can install them directly.

/// tip

It's a (very) good idea to put the packages and versions your program needs in a file (for example `requirements.txt` or `pyproject.toml`).

/// note | 참고

이 경우 FastAPI는 리스트의 내용을 검사하지 않음을 명심하세요.

예를 들어, `list[int]`는 리스트 내용이 정수인지 검사(및 문서화)합니다. 하지만 `list` 단독일 경우는 아닙니다.

///

## 더 많은 메타데이터 선언 { #declare-more-metadata }

매개변수에 대한 정보를 추가할 수 있습니다.

해당 정보는 생성된 OpenAPI에 포함되고 문서 사용자 인터페이스 및 외부 도구에서 사용됩니다.

/// note | 참고

도구에 따라 OpenAPI 지원 수준이 다를 수 있음을 명심하세요.

   *
   * @see Stream#findFirst()
   * @throws NullPointerException if the last element of the stream is null
   */
  /*
   * By declaring <T> instead of <T extends @Nullable Object>, we declare this method as requiring a
   * stream whose elements are non-null. However, the method goes out of its way to still handle
   * nulls in the stream. This means that the method can safely be used with a stream that contains