How can i connect to a network SSID with a py script

I've tried googling this but nothing came up about connecting to a network SSID with a python script What I mean is when you open the script up it comes up with a

ssid = raw_input("SSID: ")

so you enter the network name for example : BTHub5-F2Q5 then it will detect it in your range And try to connect I can sort the password bit out.