This is a short python snippet to find the address detail and it's postal code using pygeocoder lib

get_postal_code.py

"""
AUTHOR - Vinay Chittora

This api is written under pygeocoder 
Google Maps api-v3

INSTALLATION
------------------------------------------------------
$ pip install pygeocoder

USAGE
------------------------------------------------------
$ python get_postal_code <address>

"""

import time
import sys
from pygeocoder import Geocoder
from pygeolib import GeocoderError

class AddressValidation():
	def __init__(self, address):
		self.address = address
		self.result = self.get_clean_address()

	def benchmark(self):
		start_time = time.time()
		print "Looking for a valid address -> @%s " % start_time
		if not self.get_clean_address():
			print "This doesn't seems like a valid address"
			sys.exit(1)
		print "Found result in -> @%s " % str(time.time() - start_time)
		print "Formatted Address = %s " % str(self.result.formatted_address)
		print "Postal Code = %s " % self.result.postal_code
		print "Geo Coordinates = %s " % str(self.result[0].coordinates)

	def get_clean_address(self):
		try:
			self.result = Geocoder.geocode(self.address)
		except GeocoderError:
			self.result = None
		return self.result
	
	def get_postal_code(self):
		if self.result:
			return self.result.postal_code
		else : 
			return None

	def get_geo_coordinates(self):
		if self.result:
			return self.result[0].coordinates
		else : 
			return None
	def get_formatted_address(self):
		if self.result:
			return self.result.formatted_address
		else : 
			return None
			

if __name__ == '__main__':
    AddressValidation(sys.argv[1]).benchmark()