code: def tar_url(self):
      return "https://s3.amazonaws.com/quantopian-public-zipline-data/quandl"
  
imports: from datetime import datetime
  import pandas
  from six.moves.urllib.parse import urlencode
  from catalyst.data.bundles.core import register_bundle
  from catalyst.data.bundles.base_pricing import BaseEquityPricingBundle
  from catalyst.utils.memoize import lazyval
  from logbook import Logger
  from catalyst.constants import LOG_LEVEL
  from catalyst.utils.calendars import register_calendar_alias
label_desc: Use image node_id 4 for calling the QuandlBundle obj's underlying member method code with example usage: obj.tar_url() and returns: str