从这个范例程序的代码上来看，不算复杂，从中没有见到爬取网站之类的代码。关键的是第6行，通过调用pdr.get_data_yahoo方法从雅虎网站获取数据，这个方法的参数分别是股票代码，开始日期和结束日期。第4行使用yf.pdr_override方法是为了防止雅虎网站修改获取历史数据的API接口而导致get_data_yahoo方法不可用。
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