code: def main():
      fromYear = 2000
      toYear = 2013
  
      try:
          symbolsFile = os.path.join("..", "symbols", "merval.xml")
          callback = lambda stock: download_files_for_symbol(
              stock.getTicker(), fromYear, toYear
          )
          symbolsxml.parse(symbolsFile, callback, callback)
      except Exception as e:
          logger.error(str(e))
  
imports: import os
  import sys
  import pyalgotrade.logger
  from pyalgotrade.tools import yahoofinance
  import symbolsxml
label_desc: Use image node_id 3 for calling a global function with example usage: main() without return types