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pivot_table：
In [11]: medals = df.pivot_table('no of medals', ['Year', 'Country'], 'medal')In [12]: medalsOut[12]:medal Bronze Gold SilverYear Country1896 Afghanistan 3 5 4 Algeria3 1 2以及是否要重新排列列：
In [12]: medals.reindex_axis(['Gold', 'Silver', 'Bronze'], axis=1)Out[12]:medal Gold Silver BronzeYear Country1896 Afghanistan 5 4 3 Algeria 1 2 3
