add comments in file

Author: Tobias Fuhrimann

push-changes.html.md.erb

@@ -10,17 +10,22 @@ In this step you’ll learn how to propagate a local change to the application t
 Change the `return` property in the `app.py` file to 'I am awesome!'. Your final result should look something like this:
 
 ```python
-from flask import Flask
+# import dependencies
 import os
+from flask import Flask
 
+# bootstrap the app
 app = Flask(__name__)
 
+# set the port dynamically with a default of 3000 for local development
 port = int(os.getenv('PORT', '3000'))
 
+# our base route which just returns a string
 @app.route('/')
 def hello_world():
-    return 'I am awesome!.'
+    return 'I am awesome!'
 
+# start the app
 if __name__ == '__main__':
     app.run(host='0.0.0.0', port=port)
 ```