code: def tar_url(self):
      return (
          "https://s3.amazonaws.com/enigmaco/catalyst-bundles/"
          "poloniex/poloniex-bundle.tar.gz"
      )
  
file_path: catalyst/catalyst/data/bundles/poloniex.py
imports: import sys
  from six.moves.urllib.parse import urlencode
  import pandas
  from catalyst.data.bundles.core import register_bundle
  from catalyst.data.bundles.base_pricing import BaseCryptoPricingBundle
  from catalyst.utils.memoize import lazyval
  from catalyst.curate.poloniex import PoloniexCurator
label_desc: Use image node_id 4 for calling the PoloniexBundle obj's underlying member method code with example usage: obj.tar_url() and returns: str