```

    第二个版本是「绝对导入」：

    ```Python
    from app.routers import items, users
    ```

    要了解有关 Python 包和模块的更多信息，请查阅<a href="https://docs.python.org/3/tutorial/modules.html" class="external-link" target="_blank">关于 Modules 的 Python 官方文档</a>。

### 避免名称冲突

我们将直接导入 `items` 子模块，而不是仅导入其 `router` 变量。

这是因为我们在 `users` 子模块中也有另一个名为 `router` 的变量。

如果我们一个接一个地导入，例如：

```Python

!!! note
    If you check the new (fake) database `fake_users_db`, you will see how the hashed password looks like now: `"$2b$12$EixZaYVK1fsbw1ZfbX3OXePaWxn96p36WQoeG6Lruj3vjPGga31lW"`.

## Handle JWT tokens

Import the modules installed.

Create a random secret key that will be used to sign the JWT tokens.

To generate a secure random secret key use the command:

<div class="termy">

```console
$ openssl rand -hex 32

          <name>modules</name>
          <version>4.0.0+</version>
          <description>The modules (sometimes called subprojects) to build as a part of this
            project. Each module listed is a relative path to the directory containing the module.
            To be consistent with the way default urls are calculated from parent, it is recommended
            to have module names match artifact ids.</description>

    without stabilizing these new APIs first.

    Do not use these experimental APIs in modules that may be executed using a version of OkHttp
    different from the version that the module was compiled with. Do not use them in published
    libraries. Do not use them if you aren't willing to track changes to them.

 *  Breaking: Drop support for Kotlin Multiplatform.

🎏 📁 📊 ⏮️ 🏤:

```
.
├── app                  # "app" is a Python package
│   ├── __init__.py      # this file makes "app" a "Python package"
│   ├── main.py          # "main" module, e.g. import app.main
│   ├── dependencies.py  # "dependencies" module, e.g. import app.dependencies
│   └── routers          # "routers" is a "Python subpackage"
│   │   ├── __init__.py  # makes "routers" a "Python subpackage"

## Create the Pydantic models

Now let's check the file `sql_app/schemas.py`.

!!! tip
    To avoid confusion between the SQLAlchemy *models* and the Pydantic *models*, we will have the file `models.py` with the SQLAlchemy models, and the file `schemas.py` with the Pydantic models.

    These Pydantic models define more or less a "schema" (a valid data shape).

/compiler/testData/mockJDK9/ "Kotlin Build Infrastructure"
/compiler/testData/mockJDKModified/ "Kotlin Build Infrastructure"
/compiler/testData/moduleProtoBuf/ "Kotlin JVM"
/compiler/testData/modules.xml/ "Kotlin Compiler Core"
/compiler/testData/multiModule/ "Kotlin Compiler Core"
# UNKNOWN: /compiler/testData/multiplatform/
/compiler/testData/parseCodeFragment/ "Kotlin Compiler Core"

        return false;
      }
    }
    return false;
  }

  /**
   * Returns an unmodifiable view of the specified navigable set. This method allows modules to
   * provide users with "read-only" access to internal navigable sets. Query operations on the
   * returned set "read through" to the specified set, and attempts to modify the returned set,

    }

    interface AmbiguousExpects : KtFirDiagnostic<KtNamedDeclaration> {
        override val diagnosticClass get() = AmbiguousExpects::class
        val declaration: KtSymbol
        val modules: List<FirModuleData>
    }

    interface NoActualClassMemberForExpectedClass : KtFirDiagnostic<KtNamedDeclaration> {
        override val diagnosticClass get() = NoActualClassMemberForExpectedClass::class

# Corpo - Modelos aninhados

Com o **FastAPI**, você pode definir, validar, documentar e usar modelos profundamente aninhados de forma arbitrária (graças ao Pydantic).

## Campos do tipo Lista

Você pode definir um atributo como um subtipo. Por exemplo, uma `list` do Python:

```Python hl_lines="14"
{!../../../docs_src/body_nested_models/tutorial001.py!}
```