题目6单选题
有dataframe结构的数据df_obj = pd.DataFrame([[1,2,3],[2,1,1],[4,3,1],[5,1,2]],columns=['a','b','c']) 输出列名为"c"的列中元素大于1的所有列数据A. df_obj.loc[df_obj.iloc[:,"c"]>1,:]B. df_obj.loc[df_obj.loc[:,"c"]>1,:]C. df_obj.loc[df_obj.loc[:,2]>1,:]D. df_obj.loc[:,df_obj.loc[2,:]>1]
题目7单选题
有dataframe结构的数据df_obj = pd.DataFrame([[1,2,3],[2,1,1],[4,3,1],[5,1,2]],columns=['a','b','c']) 输出第二行中为1,并且第三行中为3的列数据A. df_obj.loc[(df_obj.loc[1,:]==1)&(df_obj.loc[2,:]==3),:]B. df_obj.loc[:,(df_obj.loc[2,:]==1)&(df_obj.loc[3,:]==3)]C. df_obj.loc[:,(df_obj.loc[1,:]==1)&(df_obj.loc[2,:]==3)]D. df_obj.loc[(df_obj.loc[2,:]==1)&(df_obj.loc[3,:]==3),:]