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Update 07-常用函数.md

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Original file line number	Diff line number	Diff line change
`@@ -138,7 +138,7 @@ def chain(current, last):`
`138`	`138`
`139`	`139`	```python
`140`	`140`	`# 从df_all中过滤df2`
`141`		`-df = df_all.append(df2).drop_duplicates(keep=False)`
	`141`	`+df = df_all.append(df2).drop_duplicates(subset=['case_number'], keep=False)`
`142`	`142`
`143`	`143`	`# 对于给定的列,一个Dataframe过滤另一个Dataframe该列的值;相当于集合的差集操作`
`144`	`144`	`def difference(left, right, on):`

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