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Update 06-数据汇总.md

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Original file line number	Diff line number	Diff line change
`@@ -122,6 +122,8 @@ copydf = copydf.drop(copydf[copydf['a']< botrange].index)`
`122`	`122`	`# 数据透视表`
`123`	`123`	`pd.pivot_table(df_inner,index=['city'],values=['price'],columns=['gender'], \`
`124`	`124`	`aggfunc=[len,np.sum], fill_value=0, margins=True)`
	`125`	`+# 文本变量取最后一个值`
	`126`	`+pd.pivot_table(df_inner, index=['gender'], values=['city'], aggfunc='last')`
`125`	`127`
`126`	`128`	`import datetime`
`127`	`129`	`df = pd.DataFrame({'A': ['one', 'one', 'two', 'three'] * 6,`

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