code: def dhcp_configuration_from_querystring(querystring, option=u'DhcpConfiguration'):
      
  
      key_needle = re.compile(u'{0}.[0-9]+.Key'.format(option), re.UNICODE)
      response_values = {}
  
      for key, value in querystring.items():
          if key_needle.match(key):
              values = []
              key_index = key.split(".")[1]
              value_index = 1
              while True:
                  value_key = u'{0}.{1}.Value.{2}'.format(
                      option, key_index, value_index)
                  if value_key in querystring:
                      values.extend(querystring[value_key])
                  else:
                      break
                  value_index += 1
              response_values[value[0]] = values
      return response_values
docs: turn:
          {u'AWSAccessKeyId': [u'the_key'],
           u'Action': [u'CreateDhcpOptions'],
           u'DhcpConfiguration.1.Key': [u'domain-name'],
           u'DhcpConfiguration.1.Value.1': [u'example.com'],
           u'DhcpConfiguration.2.Key': [u'domain-name-servers'],
           u'DhcpConfiguration.2.Value.1': [u'10.0.0.6'],
           u'DhcpConfiguration.2.Value.2': [u'10.0.0.7'],
           u'Signature': [u'uUMHYOoLM6r+sT4fhYjdNT6MHw22Wj1mafUpe0P0bY4='],
           u'SignatureMethod': [u'HmacSHA256'],
           u'SignatureVersion': [u'2'],
           u'Timestamp': [u'2014-03-18T21:54:01Z'],
           u'Version': [u'2013-10-15']}
      into:
          {u'domain-name': [u'example.com'], u'domain-name-servers': [u'10.0.0.6', u'10.0.0.7']}