Connect and stayed connected to AirPennNet.

connect.py

import sys
import time

from sh import networksetup

DEVICE = 'en0'
NETWORK = u'AirPennNet'


def connect_to_network(network):
    networksetup('-setairportnetwork', DEVICE, network)


def get_network():
    return networksetup('-getairportnetwork', DEVICE).strip().split()[-1]


def set_wifi_on():
    networksetup('-setairportpower', DEVICE, 'on')


def set_wifi_off():
    networksetup('-setairportpower', DEVICE, 'off')


def toggle_wifi():
    set_wifi_off()
    set_wifi_on()


def main():
    while True:
        while get_network() != NETWORK:
            print get_network(), NETWORK

            print "toggling wifi..."
            toggle_wifi()

            print "connecting to %s..." % NETWORK
            connect_to_network(NETWORK)
            time.sleep(5)
        time.sleep(1)
    return 0


if __name__ == "__main__":
    sys.exit(main())