docstr: Invalid symbols that quandl has had in its metadata:
docstr_tok: ["Invalid","symbols","that","quandl","has","had","in","its","metadata",":"]
code: def _excluded_symbols(self):
      """
      Invalid symbols that quandl has had in its metadata:
      """
      return frozenset({"TEST123456789"})
  
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 6 for calling the QuandlBundle obj's underlying member method code with example usage: obj._excluded_symbols() and returns: frozenset