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Update 03-数据表清洗.md

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Original file line number	Diff line number	Diff line change
`@@ -261,6 +261,8 @@ df['city']=df['city'].str.lower() #小写`
`261`	`261`	`df['city']=df['city'].str.swapcase() #大小写互换`
`262`	`262`	`df['city']=df['city'].str.capitalize() #首字母大写`
`263`	`263`	`df['city']=df['city'].str.title() #字符串中的每个单词首字母大写`
	`264`	`+`
	`265`	`+df.columns = df.columns.map(lambda x: x.lower()) #将列名统一改为小写`
`264`	`266`	```
`265`	`267`
`266`	`268`	`<br/>`

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