实例

实例

创建一个fast_api_main.py文件，写入一下代码：

from fastapi import FastAPI
app = FastAPI()
@app.get("/")
def index():
    """
    首页
    """
    return {"index": "我是首页"}
@app.get("/book/{book_id}")
def book(book_id: int, book_name: str = None):
    """
    书籍📚
    这里必须为book_id，与路径值保持一致，否则会被认为Query参数
    """
    return {
        "id": book_id,
        "book_name": book_name
    }

运行

uvicorn fast_api_main:app --reload
INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [54581] using statreload
INFO:     Started server process [54583]
INFO:     Waiting for application startup.
INFO:     Application startup complete.

fast_api_main为文件名
app为文件内通过app = FastAPI()创建的对象
—reload表示让服务器更新代码后重新启动

请求响应效果

import requests
print(requests.get("http://localhost:8000/").json())
# {'index': '我是首页'}
print(requests.get("http://localhost:8000/book/1/", params={"book_name": "数学之美"}).json())
# {'id': 1, 'book_name': '数学之美'}
print(requests.get("http://localhost:8000/book/1/").json())
# {'id': 1, 'book_name': None}