code: def get_catalyst_symbol(market_or_symbol):
      """
      The Catalyst symbol.
  
      Parameters
      ----------
      market_or_symbol
  
      Returns
      -------
  
      """
      if isinstance(market_or_symbol, string_types):
          parts = market_or_symbol.split("/")
          return "{}_{}".format(parts[0].lower(), parts[1].lower())
  
      else:
          return "{}_{}".format(
              market_or_symbol["base"].lower(),
              market_or_symbol["quote"].lower(),
          )
  
imports: import hashlib
  import json
  import os
  import pickle
  import shutil
  from datetime import date, datetime
  import pandas
  from catalyst.assets._assets import TradingPair
  from six import string_types
  from six.moves.urllib import request
  from catalyst.constants import DATE_FORMAT, SYMBOLS_URL
  from catalyst.exchange.exchange_errors import ExchangeSymbolsNotFound
  from catalyst.exchange.utils.serialization_utils import ExchangeJSONEncoder, ExchangeJSONDecoder
  from catalyst.utils.memoize import weak_lru_cache
  from catalyst.utils.paths import data_root, ensure_directory, last_modified_time
label_desc: Use image node_id 29 for calling a global function with example usage: get_catalyst_symbol(market_or_symbol) and returns: str, str