flask_restful

# 开发环境

conda:4.8.2 #通过 anaconda 安装

python:3.6

flask:1.1.1 # 1. conda install flask; 2. pip install flask

flask_restful:0.3.8 # pip install flask_restful

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# 引入 flask 、flask_restful

from flask import Flask
from flask_restful import  Resource,Api

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# 初始化 Api

app = Flask(__name__)
api = Api(app)

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# 创建路由

class HelloWorld(Resource):
    def get(self):
    return{}
api.add_resource(HelloWorld,'/')

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# 通过第三方工具调用查看或者通过命令行调用

# 通过参数查询和新增数据

values = {}
class AddValue(Resource):
    def get(self,id):
        return {id:values.get(id)}

    def post(self,id):
        try:
            values[id] = json.loads(request.data.decode())
            return {id : values[id]}
        except:
            return '数据格式错误'

    def put(self,id):
        try:
            values[id] = json.loads(request.data.decode())
            return {id : values[id]}
        except:
            return '数据格式错误'

    def delete(self,id):
        del values[id]
        return '删除成功：'+ str(id)

api.add_resource(AddValue,'/<int:id>')

#参数设置 <int:id>
# int:限制参数数据类型
# id: 参数名称, 需要在 get put 参数中添加同名参数

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# 格式化输出

# 引入 fields,marshal_with
from flask_restful import fields,marshal_with,abort,reqparse

#构建返回数据的格式
todo_field={
    'id':fields.Integer(),
    'title':fields.String(default=''),
    'content':fields.String(default='')
}

class TODO(object):
    def __init__(self, id, title, content):
        self.id = id
        self.title = title
        self.content = content

class TodoList(Resource):
    @marshal_with(todo_field) #,envelope='resource'   envelope用户对返回的数据进行封装
    def get(self, id = None):
        todolist =list(filter(lambda t: t.id == id, TodoLists))

        if len(todolist) ==0:
            abort(400)
        else:
            val = todolist[0]
            return val

    #@marshal_with(todo_field)
    def post(self):
        parse = reqparse.RequestParser() # 格式化传入的数据
        parse.add_argument('id',trim=True, type=int,  help='todolist id')
        parse.add_argument('title',type=str )
        parse.add_argument('content',type=str )
        args = parse.parse_args()
        id = int(args.get('id'))
        #查询数据列表
        todo = list(filter(lambda t: t.id == id, TodoLists))
        if len(todo) == 0:
            todo = TODO(id, title=args.get('title'), content=args.get('content'))
            TodoLists.append(todo)
            return jsonify({
                "msg":"添加成功"
            })
        else:
            print({"msg":'资源已存在'})
            return jsonify({"msg":'资源已存在'}), 403

api.add_resource (TodoList, '/todo/', '/todo/<int:id>/',endpoint='todo')

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参考:https://flask-restful.readthedocs.io/en/latest/

参数类型：http://www.pythondoc.com/Flask-RESTful/extending.html#id6

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