How to organize automatic switching of wi-fi to 3g usb modem?

Question

Python

Good day, due to the terrible Internet, it became necessary to automatically disconnect from Wi-fi, in the absence of a response from the server, and turn on the 3g modem. Also switching back, when restoring the work of the Internet via wi-fi. I would like to use python.
Os : ubuntu 12.04

Answer 1

there is no question, there is only TK. is this a work order?