mkdir demo
cd demo
python3 -m venv venv

source venv/bin/active
pip install fastapi

pip install uvicorn # Asgi服务器

click==7.1.2
fastapi==0.63.0
h11==0.12.0
pydantic==1.8.1
starlette==0.13.6
typing-extensions==3.7.4.3
uvicorn==0.13.4

uvicorn main:app --reload #5. 运行开发服务器

# 注释
main 表示文件名称
app 表示FastAPI实例
reload 内似前端HotReload

(venv) ➜  1-first curl 127.0.0.1:8000
"Hello FastAPI"

from fastapi import FastAPI

app = FastAPI()

@app.get('/')
def hello():
  return 'Hello'

if __name__ == '__main__':
      import uvicorn
    uvicorn.run(app, host='127.0.0.1', port=8000)

from fastapi import FastAPI

# 创建实例 FastAPI 是一个为你的 API 提供了所有功能的 Python 类。
app = FastAPI()

@app.get('/per/{name}/{id}')
def personInfo(id: int, name: str): # 有类型的路径参数 好处1.错误检查  2.代码补全
    return {
        "ID": id,
        "Name": name
    }

# 输入
http://127.0.0.1:8000/per/张三/2
http://127.0.0.1:8000/per/李四/8
# 输出
{"ID":2,"Name":"张三"}
{"ID":8,"Name":"李四"}

from typing import Optional
from fastapi import FastAPI

# 创建实例
app = FastAPI()

@app.get('/query/')
def question(key: Optional[str]=None):
    return '您正在查询 {}'.format(key)

# 输入
http://127.0.0.1:8000/query/?key=你好
# 输出
"您正在查询 你好"

domain/docs

from fastapi import FastAPI

app = FastAPI()


@app.post("/items/", status_code=201) # 201
async def create_item(name: str):
    return {"name": name}

from fastapi import FastAPI, status
app = FastAPI()

@app.post("/items/", status_code=status.HTTP_201_CREATED)
async def create_item(name: str):
    return {"name": name}

pip install jinja2 # 模版渲染
pip install aiofiles # 处理静态文件

# 模版引擎
from fastapi import Request
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles
from fastapi.responses import HTMLResponse
app.mount("/static", StaticFiles(directory="static"), name="static")
templates = Jinja2Templates(directory="templates")
@app.get('/template', response_class=HTMLResponse)
async def templateDemo(request: Request):
    return templates.TemplateResponse("index.html", {"request": request})