Update app.py

app.py

@@ -1,9 +1,12 @@
 from flask import Flask, request
-# ...
+app = Flask(__name__)
 
 @app.route('/json_example', methods=['POST'])
 def handle_json():
     data = request.json
     print(data.get('name'))
     print(data.get('age'))
-    return data
+    return data
+
+if __name__ == '__main__':
+   app.run()