code: def data(ticker_list):
      return YahooDownloader(
          start_date="2019-01-01",
          end_date="2019-02-01",
          ticker_list=ticker_list,
      ).fetch_data()
  
file_path: FinRL/unit_tests/environments/test_cash_penalty.py
imports: from __future__ import annotations
  import numpy
  import pytest
  from finrl.meta.env_stock_trading.env_stocktrading_cashpenalty import StockTradingEnvCashpenalty
  from finrl.meta.preprocessor.yahoodownloader import YahooDownloader
label_desc: Use image node_id 3 for calling a global function with example usage: data(ticker_list) and returns: YahooDownloader