code: def mac(addr):
      '''
      Validates a mac address
      '''
      valid = re.compile(r'''
                        (^([0-9A-F]{1,2}[-]){5}([0-9A-F]{1,2})$
                        |^([0-9A-F]{1,2}[:]){5}([0-9A-F]{1,2})$
                        |^([0-9A-F]{1,2}[.]){5}([0-9A-F]{1,2})$)
                        ''',
                        re.VERBOSE | re.IGNORECASE)
      return valid.match(addr) is not Nonf mac(addr):
      '''
      Validates a mac address
      '''
      valid = re.compile(r'''
                        (^([0-9A-F]{1,2}[-]){5}([0-9A-F]{1,2})$
                        |^([0-9A-F]{1,2}[:]){5}([0-9A-F]{1,2})$
                        |^([0-9A-F]{1,2}[.]){5}([0-9A-F]{1,2})$)
                        ''',
                        re.VERBOSE | re.IGNORECASE)
      return valid.match(addr) is not None
docs: Validates a mac address