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ztonyz1212 ztonyz1212

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Update 04-数据预处理.md

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`‎04-数据预处理.md`

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Original file line number	Diff line number	Diff line change
`@@ -87,6 +87,10 @@ df.loc[::-1].reset_index(drop=True)`
`87`	`87`
`88`	`88`	`# 将所有列反转`
`89`	`89`	`df.loc[:, ::-1]`
	`90`	`+`
	`91`	`+# 根据序号重排列`
	`92`	`+cols = df.columns[[3,2,1,0]]`
	`93`	`+df_new = df[cols]`
`90`	`94`	```
`91`	`95`
`92`	`96`	`<br/>`

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