flask

# 路由
## 定义方法
```
@app.route("/",methods=['get'])   #可以定义多个方法 如 get put delete
def test():
    p=Person("david",21)
    return  json.dumps(p.__dict__)
```
## url 传参
```
@app.route("/user/<id>/student/<sex>",methods=['get'])
def user(id,sex):
    print(sex)
    return id,sex
```
可以指定类型
string
int
float

```
@app.route("/user/<int:id>/student/<sex>",methods=['get'])
def user(id,sex):
    print(sex)
    return id,sex
```

# 接口数据接受
```
@app.route("/post",methods=['POST'])
def test1():
    #http://127.0.0.1:5000/login?username&password    args 接受
    if flask.request.method=="POST":
        name=flask.request.args.get("username")
        pw=flask.request.args.get("password")
        print(name)
        return {"username":name,"password":pw}

return "error"
@app.route("/login",methods=['POST'])
def login():
    if flask.request.method=="POST":
        #form-data  json 接受
        info=flask.request.form.get("username")
        print(info)
        return {"msg":"ok"},200

@app.route("/update/<id>",methods=["PUT"])
def test3(id):
    if flask.request.method=="PUT":
        j=flask.request.get_json() # raw json 接受
        j["id"]=id
        Student(**j).printself()
        data = {'message': '请求成功'}
        print(id)
        return flask.jsonify(data), 200  # 返回状态码为200

```