交叉表是一种特殊的透视表，往往用来统计频次，也可以使用参数aggfunc指定聚合函数实现其他功能。扩展库pandas提供了crosstab()函数用来生成交叉表，返回新的DataFrame，其语法为：
crosstab(index, columns, values=None, rownames=None, colnames=None, aggfunc=None, margins=False, dropna=True, normalize=False)
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其中，参数aggfunc用来指定聚合函数，默认为统计次数。
本文使用的数据文件为C:\Python36\超市营业额2.xlsx，部分数据与格式如下：
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下面的代码使用交叉表分析上面Excel文件中的数据，分析各员工上班情况以及在不同柜台的业绩。
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