error: [errno 13] Permission denied - What permissions does bottle py require? - python-2.7

Question

I am trying to run bottle py but getting this error:
Traceback (most recent call last):
File "/home/pi/Desktop/gggg.py", line 176, in <module>
run(host='somehost', port=81)
File "/usr/lib/python2.7/dist-packages/bottle.py", line 2426, in run
server.run(app)
File "/usr/lib/python2.7/dist-packages/bottle.py", line 2123, in run
srv = make_server(self.host, self.port, handler, **self.options)
File "/usr/lib/python2.7/wsgiref/simple_server.py", line 144, in make_server
server = server_class((host, port), handler_class)
File "/usr/lib/python2.7/SocketServer.py", line 419, in __init__
self.server_bind()
File "/usr/lib/python2.7/wsgiref/simple_server.py", line 48, in server_bind
HTTPServer.server_bind(self)
File "/usr/lib/python2.7/BaseHTTPServer.py", line 108, in server_bind
SocketServer.TCPServer.server_bind(self)
File "/usr/lib/python2.7/SocketServer.py", line 430, in server_bind
self.socket.bind(self.server_address)
File "/usr/lib/python2.7/socket.py", line 224, in meth
return getattr(self._sock,name)(*args)
error: [Errno 13] Permission denied
>>>
I am logged in as "pi". Logging in as root user solves the issue. My question is what permissions does the bottle py and python need to run (which folders and what permissions)?
Edit:
Not sure if it matters but my python files are in Desktop dir. I also set the permissions of the folder/sub-folder to read write for all.

Answer 1

1) If you're planning on running this in production, you shouldn't be using Bottle's built in web server. You should use Apache, nginx, etc. From the Bottle docs:
The built-in default server is based on wsgiref WSGIServer. This
non-threading HTTP server is perfectly fine for development and early
production, but may become a performance bottleneck when server load
increases. There are three ways to eliminate this bottleneck:
Use a different server that is either multi-threaded or asynchronous.
Start multiple server processes and spread the load with a load-balancer.
Do both.
2) [As you know,] You have to be root to bind to port 80; no way around that. Have you considered using sudo?
sudo /home/pi/Desktop/gggg.py
You could configure sudoers to securely allow user "pi" to execute only gggg.py (or whatever webserver you'll end up using for production).

Answer 2

Thanks to #Wooble I realised that permission error had to do with the port and not the file system.
A working workaround is to use port above 1024 which works perfectly and is fine for development. Using port 200 for now:
run(host='someIP', port=2000)
I am still looking for a port 80 permission error solution though.