gistfile1.py

# DuckDuckGo (sudo pip install duckduckgo)
>>> import duckduckgo
>>> r = duckduckgo.query("ip address")
>>> r.answer.text
'Your IP address is ...'
>>> import re
>>> address_regexp = re.compile ('\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}')
>>> result = address_regexp.search( r.answer.text )
>>> result.group()
'xx.xx.xx.xxx'

# DynDNS
>>> import urllib2
>>> ip_checker_url = "http://checkip.dyndns.org/"
>>> response = urllib2.urlopen(ip_checker_url).read()
>>> result = address_regexp.search(response)
>>> result.group()
'xx.xx.xx.xxx'