gistfile1.txt

#!/usr/bin/env python

from SystemConfiguration import *
import syslog

interface = "en0"

store = SCDynamicStoreCreate(None, "global-network", None , None)
ifKey = "State:/Network/Interface/" + interface + "/IPv4"
keyStore = SCDynamicStoreCopyValue(store, ifKey)

# If the Print fails, then there's no IP Address for that interface and we can assume
#    that the interface is in a down state - we return false
try:
   print "The IP Address for interface: " + interface + " is: " + keyStore['Addresses'][0]
except TypeError:
   syslog.syslog(syslog.LOG_ALERT, "Interface " + interface + " not active.")
   return "false"

# The IP Address is returned in Unicode - beware of that
return keyStore['Addresses'][0]