Address checker

address.py

import re

_POSTCODE_RE = re.compile('\s*[a-zA-Z]{1,2}[0-9][0-9a-zA-Z]?\s?[0-9][a-zA-Z]{2}\s*')
_SPLIT_POSTCODE_RE = re.compile('(.*)\s*([a-zA-Z]{1,2}[0-9][0-9a-zA-Z]?\s?[0-9][a-zA-Z]{2})\s*')
_COORDS_RE = re.compile("^([0-9.-]+),([0-9.-]+)$")

def is_coords(address):
  return _COORDS_RE.match(address) != None

def is_postcode(address):
  return _POSTCODE_RE.match(address) != None

def split_address(address):
  matches = _SPLIT_POSTCODE_RE.match(address)
  address = None
  postcode = None
  if matches:
    address = m.group(1)
    postcode = m.group(2)
    if address:
      address = address.strip()
    else:
      address = None
    
    if postcode:
      postcode = postcode.upper().strip()
    else:
      postcode = None
  return address, postcode
  

## Tests
print is_coords("12.345,-1.7011")
print is_postcode("N1 8SU")
print is_postcode("  w2 4dy")
print is_postcode("286, New North Road, London N1 8SU")
print split_address("286, New North Road, London N1 8Ssu")