add python_restful_api.py

README.md

@@ -35,6 +35,8 @@
 ### python_version36.py: Python3.6正式版要来了, 你期待哪些新特性？
 
 ### python_magic_methods: Python进阶: 实例讲解Python中的魔法函数(Magic Methods)
+
+### python_restful_api.py: 利用Python和Flask快速开发RESTful API
 ===================================================================================================
 
 ### 您可以fork该项目, 并在修改后提交Pull request

python_restful_api.py

@@ -0,0 +1,75 @@
+# _*_ coding: utf-8 _*_
+
+"""
+python_restful_api.py by xianhu
+"""
+
+from flask import Flask
+from flask_restful import reqparse, abort, Api, Resource
+
+app = Flask(__name__)
+api = Api(app)
+
+ITEMS = {
+    'item1': {'name': 'Allen', 'age': 19},
+    'item2': {'name': 'Lily', 'age': 18},
+    'item3': {'name': 'James', 'age': 20},
+}
+
+
+def abort_if_item_doesnt_exist(item_id):
+    if item_id not in ITEMS:
+        abort(404, message="Item {} doesn't exist".format(item_id))
+
+
+def get_new_item_id():
+    for key in ITEMS:
+        item_id = 'item' + str(int(key.strip('item')) + 1)
+        if item_id not in ITEMS:
+            return item_id
+
+
+parser = reqparse.RequestParser()
+parser.add_argument('name', type=str, required=True, help='need name data')
+parser.add_argument('age', type=int, required=True, help='need age data')
+
+
+# 操作（put / get / delete）单一资源
+class Todo(Resource):
+
+    def put(self, item_id):
+        args = parser.parse_args()
+        item = {'name': args['name'], 'age': args['age']}
+        ITEMS[item_id] = item
+        return item, 201
+
+    def get(self, item_id):
+        abort_if_item_doesnt_exist(item_id)
+        return ITEMS[item_id], 200
+
+    def delete(self, item_id):
+        abort_if_item_doesnt_exist(item_id)
+        del ITEMS[item_id]
+        return '', 204
+
+
+# 操作（post / get）资源列表
+class TodoList(Resource):
+
+    def get(self):
+        return ITEMS, 200
+
+    def post(self):
+        args = parser.parse_args()
+        item_id = get_new_item_id()
+        ITEMS[item_id] = {'name': args['name'], 'age': args['age']}
+        return ITEMS[item_id], 201
+
+
+# 设置路由
+api.add_resource(TodoList, '/items')
+api.add_resource(Todo, '/items/<item_id>')
+
+
+if __name__ == '__main__':
+    app.run(debug=True)