python fastapi

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 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:

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.

python fastapi gzip

在Python FastAPI中，gzip是一种常用的压缩工具，用于减少HTTP响应的数据传输量，提高网络传输效率。FastAPI本身并不内置对gzip的支持，但你可以通过第三方库`Uvicorn`和`Compress`或者直接使用Python标准库`gzip`来实现。

首先，你需要安装`Compress`库，可以使用pip进行安装：

pip install fastapi_compress

然后，在FastAPI应用中，你可以配置`Uvicorn`服务器启用gzip压缩。例如，在`main.py`文件中：

from fastapi import FastAPI
from fastapi_compress import Compress

app = FastAPI()

# 启用gzip压缩
compress = Compress(app)

@app.get("/")
async def root():
    return {"message": "Hello, World!"}

接着，启动服务时带上`--http-compression`选项：

uvicorn main:app --host 0.0.0.0 --port 8000 --http-compression

现在，当你访问应用的资源时，返回的数据会被自动进行gzip压缩。至于在HTTP请求级别启用gzip，可以在客户端设置合适的Accept-Encoding头，如浏览器或curl：

curl -H "Accept-Encoding: gzip" http://localhost:8000/