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Update 04-数据预处理.md

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Original file line number	Diff line number	Diff line change
`@@ -110,6 +110,10 @@ df['group'] = np.where(df['price'] > 3000, 'high', 'low')`
`110`	`110`	`df['sign'] = 0`
`111`	`111`	`df.loc[(df['city'] == 'beijing') & (df['price'] >= 4000), 'sign'] = 1`
`112`	`112`
	`113`	`+# 跨列判断`
	`114`	`+df['province_match'] = df.apply(lambda x: x.province1.lower() == x.province2.lower(),axis=1)`
	`115`	`+df['province_match'] = df['province_match'].astype('int')`
	`116`	`+`
`113`	`117`	`# 数据分列与合并`
`114`	`118`	`# 根据特殊符号、位置分列`
`115`	`119`	`df['first_cat'] = df['category'].str.split('-', n=1).str[0]`

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