python fastapi
时间: 2023-08-24 10:11:05 浏览: 56
FastAPI是一个基于Python的现代、快速(高性能)的Web框架,用于构建API。它使用Python的格式化字符串语法来声明路径参数或变量。你可以通过导入FastAPI模块来创建一个FastAPI应用,并使用装饰器来定义路由和处理函数。例如,你可以使用@app.get装饰器定义一个GET请求的路由,并在函数中返回一个字典作为响应。[1]另外,你还可以使用typing模块中的Optional来定义可选的参数,例如在函数中定义一个可选的查询参数q。[2]如果你想运行FastAPI应用,你可以使用uvicorn模块来启动应用。[3]
相关问题
python fastapi 源码
Python FastAPI 是一个基于 Python 编写的快速 Web 框架,其主要目的是提供简单易用的 API 开发方式。FastAPI 的源码是开放的,可以在 GitHub 上进行访问、学习和贡献,其使用的主要语言是 Python。
FastAPI 的源码主要涉及到的技术包括 ASGI、HTTP 协议、路由、请求、响应等,其代码风格简洁而明确,易读易懂。FastAPI 使用了 Pydantic 库来进行输入参数校验和数据序列化,同时也采用了模板引擎 Jinja2,便于灵活的 HTML 页面的构建。
FastAPI 的源码包含了各种各样的模块,比如监听请求入口的 `app` 模块、处理请求和响应的 `request_handlers` 模块,以及路由和 URL 处理的 `routing` 模块等。其中,`app` 模块负责管理应用程序的不同模块以及对请求进行相应的处理;`request_handlers` 模块主要处理用户请求,并生成相应的响应结果;`routing` 模块负责处理请求的 URL 地址,并根据路由定义来调用相应的 API 函数。
总之,Python FastAPI 的源码是有很大价值的,可以通过学习其源码来了解 Python Web 开发的相关技术,也可以通过参与开源社区的贡献来为该框架的发展做出自己的贡献。
Python fastapi graphql
Python fastapi is a modern, fast (high-performance) web framework for building APIs with Python 3.6+ based on standard Python type hints. Fastapi provides a built-in support for GraphQL via the `graphene` library.
GraphQL is a query language for APIs that provides a more efficient, powerful and flexible alternative to REST. With GraphQL, clients can specify exactly what they need, and they get only that information back. This reduces over-fetching and under-fetching of data, makes APIs faster and more efficient, and helps developers build better user interfaces.
To use Fastapi with GraphQL, you need to install `graphene` library and import it into your Fastapi application. Here's a simple example:
```python
from fastapi import FastAPI
from graphene import ObjectType, String, Schema
app = FastAPI()
class Query(ObjectType):
hello = String(name=String(default_value="World"))
def resolve_hello(root, info, name):
return f'Hello {name}!'
schema = Schema(query=Query)
@app.post("/graphql")
async def graphql(query: str):
result = schema.execute(query)
return result.data
```
In this example, we define a `Query` class that extends `graphene.ObjectType` and contains a single field called `hello`. The `hello` field takes an argument `name` with a default value of "World". When the `hello` field is resolved, it returns a string that says "Hello {name}!".
We then create a `Schema` object, passing in our `Query` class as the `query` argument. Finally, we define a Fastapi route that accepts a `POST` request with a GraphQL query as the `query` parameter. We execute the query using the `schema.execute()` method and return the `result.data` as the response.
This is just a simple example, but Fastapi with GraphQL provides a powerful platform for building APIs that are flexible, efficient and easy to use.