returns a string if set, so int() it

Author: Edward Muller

server.py

@@ -30,4 +30,4 @@ def comments_handler():
     return Response(json.dumps(comments), mimetype='application/json', headers={'Cache-Control': 'no-cache'})
 
 if __name__ == '__main__':
-    app.run(port=os.environ.get("PORT",3000))
+    app.run(port=int(os.environ.get("PORT",3000)))