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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
`@@ -212,6 +212,9 @@ df['close_matches'] = df['name'].apply(lambda x: difflib.get_close_matches(x, li`
`212`	`212`
`213`	`213`	`# 取出list中的字符串,相似度未达到阈值则为空`
`214`	`214`	`df['close_matches'] = df['close_matches'].apply(lambda x: x[0] if len(x)>0 else np.nan)`
	`215`	`+`
	`216`	`+# 计算相似度`
	`217`	`+df['diff_score'] = df.apply(lambda x: difflib.SequenceMatcher(None, x.col1, x.col2).quick_ratio(), axis=1)`
`215`	`218`	```
`216`	`219`
`217`	`220`	`<br/>`
`@@ -549,4 +552,4 @@ cut_df(df, 5)`
`549`	`552`
`550`	`553`
`551`	`554`
`552`		`-\| [< <目录](./README.md) \| [返回顶部 ↑](#07-常用函数) \|`
	`555`	`+\| [< <目录](./README.md) \| [返回顶部 ↑](#07-常用函数) \|`

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