code: def _format_polo_query(self, query_params):
      # TODO: got against the exchange object
      return "https://poloniex.com/public?{query}".format(
          query=urlencode(query_params),
      )
  
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 11 for calling the PoloniexBundle obj's underlying member method code with example usage: obj._format_polo_query(query_params) and returns: str