import-pandas-nTsingTao-=-pdread_csvCTsingTaocsvnTsingTaoindex-=-TsingTaoiloc0nTsingTaoindex-=-pdto_datetimeTsingTaoindexformat=Ymdnn从上面的参数代码中按下面函数参数提取出stock_codetimefrequencystart_dateend_date：ndef-week_period_strategystock_codetimefrequencystart_da
(stock_code = 'TsingTao', timefrequency = 'week', start_date = '2010-01-01', end_date = '2020-12-31')
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