Update

app.py

@@ -2,10 +2,12 @@ import os
 from flask import Flask
 app = Flask(__name__)
 
+
 @app.route('/')
 def hello_world():  # put application's code here
     return 'Hello World!'
 
+
 if __name__ == '__main__':
     port = int(os.environ.get('PORT', 33507))
     app.run(host='0.0.0.0', port=port, debug=True)