This includes `pydantic.v1`, which is no longer supported in Python 3.14 and above.

If you want to use the latest features of Python, you will need to make sure you use Pydantic v2.

///

If you have an old FastAPI app with Pydantic v1, here I'll show you how to migrate it to Pydantic v2, and the **features in FastAPI 0.119.0** to help you with a gradual migration.

## Official Guide { #official-guide }

    /**
     * Pending cancel flag - indicates cancel was pending at sender
     */
    int DCERPC_PENDING_CANCEL = 0x04; /* Cancel was pending at sender */
    /**
     * Reserved flag for future use
     */
    int DCERPC_RESERVED_1 = 0x08;
    /**
     * Supports concurrent multiplexing flag.
     */
    int DCERPC_CONC_MPX = 0x10; /* supports concurrent multiplexing */
    /**

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.collect.testing.AnEnum;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.google.MultisetFeature;
import com.google.common.collect.testing.google.MultisetTestSuiteBuilder;

    "crossVersionTests": false
  },
  {
    "name": "project-features",
    "path": "platforms/core-configuration/project-features",
    "unitTests": false,
    "functionalTests": true,
    "crossVersionTests": false
  },
  {
    "name": "project-features-api",
    "path": "platforms/core-configuration/project-features-api",
    "unitTests": false,
    "functionalTests": false,

- Introduced the Node Declared Features capability (alpha), which includes:
  - A new `Node.Status.DeclaredFeatures` field for publishing node-specific features.
  - A `component-helpers` library for feature registration and inference.
  - A `NodeDeclaredFeatures` scheduler plugin to match pods with nodes that provide required features.

import com.google.common.annotations.GwtIncompatible;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.google.MultisetTestSuiteBuilder;
import com.google.common.collect.testing.google.SortedMultisetTestSuiteBuilder;

import com.google.common.collect.testing.SetTestSuiteBuilder;
import com.google.common.collect.testing.TestStringSetGenerator;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.google.MultisetTestSuiteBuilder;
import com.google.common.collect.testing.google.TestStringMultisetGenerator;

Dies schließt `pydantic.v1` ein, das unter Python 3.14 und höher nicht mehr unterstützt wird.

Wenn Sie die neuesten Features von Python nutzen möchten, müssen Sie sicherstellen, dass Sie Pydantic v2 verwenden.

///

Wenn Sie eine ältere FastAPI-App mit Pydantic v1 haben, zeige ich Ihnen hier, wie Sie sie zu Pydantic v2 migrieren, und die **Features in FastAPI 0.119.0**, die Ihnen bei einer schrittweisen Migration helfen.

import com.google.common.annotations.J2ktIncompatible;
import com.google.common.collect.testing.IteratorTester;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.features.MapFeature;
import com.google.common.collect.testing.google.SetMultimapTestSuiteBuilder;

# 高级用户指南 { #advanced-user-guide }

## 附加功能 { #additional-features }

主要的[教程 - 用户指南](../tutorial/index.md)足以带你了解 **FastAPI** 的所有主要特性。

在接下来的章节中，你将看到其他选项、配置和附加功能。

/// tip | 提示

接下来的章节**不一定是“高级”的**。

对于你的用例，解决方案很可能就在其中之一。

///

## 先阅读教程 { #read-the-tutorial-first }

仅凭主要[教程 - 用户指南](../tutorial/index.md)中的知识，你已经可以使用 **FastAPI** 的大多数功能。