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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
`@@ -122,6 +122,8 @@ pd.DataFrame((x.split('-') for x in df['category']), index=df.index,columns=['ca`
`122`	`122`	`df['category_2'] = df['first_cat'].str.cat(df['last_cat'], sep = '*')`
`123`	`123`	`df['category_2'] = df['first_cat'] + '*' +df['last_cat']`
`124`	`124`
	`125`	`+# 统计特殊符号的个数`
	`126`	`+df['cnt'] = df['reports'].apply(lambda x: x.count('\|')`
`125`	`127`
`126`	`128`	`# 根据不同的判断条件,选取不同列的数值`
`127`	`129`	`df = pd.DataFrame([`

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