Python之dataframe按照某一列分组并排序，同时加上排名

    import pandas as pd data = {'year':['2018','2019','2018','2018','2019','2019','2018','2019'],        '数学':[83,90,98,90,88,88,88,89],        '英语':[92,89,90,78,83,90,91,95]} df = pd.DataFrame(data)

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