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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
`@@ -46,6 +46,9 @@ df.groupby('city').agg(`
`46`	`46`
`47`	`47`	`# 对金额累计求和`
`48`	`48`	`df['amount'].cumsum()`
	`49`	`+`
	`50`	`+# 分组累计求和`
	`51`	`+df['sum']=df.groupby(['user_id'])['cnt'].cumsum()`
`49`	`52`	```
`50`	`53`
`51`	`54`	`<br/>`

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