有DataFrame结构数据data_obj,
data_arr = np.array([np.random.randint(10) for i in range(20)]).reshape(5,4) df_obj = pd.DataFrame(data_arr,columns=['a','b','c',"d"]) 输出”b”,”c”列
A、print(df_obj[["b":"d"]])
B、print(df_obj[["b","c"]])
C、print(df_obj[[1:3]])
D、 print(df_obj["b","c"])