⚠️ Python编写简易API

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前期准备

创建一个虚拟环境：

$ mkdir flask_restful
$ cd flask_restful
$ python3 -m venv venv

激活虚拟环境：

$ . venv/bin/activate

虚拟环境退出：

$ deactivate

安装flask和flask_restful：

$ pip install flask
$ pip install flask_restful

项目接口模拟

在项目的根目录下面新建文件api.js，在此文件中进行数据的增删改查。

from flask import Flask, jsonify, request
from flask_restful import Api, Resource

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

USER_LIST = [{'id': 1, 'name': 'jimmy'}]

class UserListApi(Resource):
    def get(self):
        return {'code': 10000, 'msg': 'get list success', 'data': USER_LIST}

    def post(self):
        json_data = request.get_json()
        new_id = len(USER_LIST) + 1
        USER_LIST.append({'id': new_id, 'name': json_data.get('name')})
        return jsonify({'code': 10000, 'msg': 'add user success', 'data': USER_LIST[new_id-1]})

class UserApi(Resource):
    def get(self, id):
        return {'code': 10000, 'msg': 'get user success', 'data': {}}

    def put(self, id):
        return {'code': 10000, 'msg': 'update user success', 'data': {}}

    def delete(self, id):
        return {'code': 10000, 'msg': 'remove user success', 'data': {}}

api.add_resource(UserListApi, '/users')
api.add_resource(UserApi, '/users/<int:id>')

if __name__ == '__main__':
    app.run(debug=True)

之后运行应用：

$ export FLASK_APP=api.py
$ export FLASK_ENV=development
$ flask run

看到下面的输出，说明运行成功了：

 * Serving Flask app "flaskr" (lazy loading)
 * Environment: development
 * Debug mode: on
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 577-682-777

项目接口验证

在上面的代码中，我们对users进行了相关的增删改查，下面我们来验证下：

• 新增一个用户

$ curl http://127.0.0.1:5000/users -X POST -H "Content-Type:application/json" -d '{"name": "tom"}'

{
  "code": 10000, 
  "data": {
    "id": 2, 
    "name": "tom"
  }, 
  "msg": "add user success"
}

• 查询整个用户列表

$ curl http://127.0.0.1:5000/users

{
    "code": 10000,
    "msg": "get list success",
    "data": [
        {
            "id": 1,
            "name": "jimmy"
        },
        {
            "id": 2,
            "name": "tom"
        }
    ]
}

• 更新一个用户

$ curl http://127.0.0.1:5000/users/1 -X PUT

{
    "code": 10000,
    "msg": "update user success",
    "data": {}
}

• 获取一个用户

$ curl http://127.0.0.1:5000/users/1

{
    "code": 10000,
    "msg": "get user success",
    "data": {}
}

• 删除一个用户

$ curl http://127.0.0.1:5000/users/1 -X DELETE

{
    "code": 10000,
    "msg": "remove user success",
    "data": {}
}

后话

• 参考：www.pythondoc.com/Flask-RESTf…

• 参考：dormousehole.readthedocs.io/en/latest/

• 更多内容：github.com/reng99

• 微信小程序云开发初体验：juejin.cn/post/693746…