code: def get_csv_filename(symbol, year):
      return os.path.join(
          storage, "%s-%d-yahoofinance.csv" % (symbol, year)
      )
  
imports: import os
  import sys
  import pyalgotrade.logger
  from pyalgotrade.tools import yahoofinance
  import symbolsxml
label_desc: Use image node_id 1 for calling a global function with example usage: get_csv_filename(symbol, year) and returns: os