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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
`@@ -348,6 +348,11 @@ import datetime`
`348`	`348`	`df['apply_date'] = df['apply_date'].map(lambda x : datetime.datetime.strptime(x, "%Y-%m-%d"))`
`349`	`349`	`df['apply_date'] = df['apply_date'].dt.strftime('%Y-%m-%d')`
`350`	`350`
	`351`	`+# 将20/9/2018 13:08:47转为月份格式`
	`352`	`+from datetime import datetime`
	`353`	`+df['time'] = df['time'].apply(lambda x: datetime.strptime(x, '%d/%m/%Y %H:%M:%S'))`
	`354`	`+df['month'] = df['time'].apply(lambda x: x.strftime('%Y-%m'))`
	`355`	`+`
`351`	`356`	`#日期字符串'%Y-%m-%d'简写形式`
`352`	`357`	`from datetime import datetime`
`353`	`358`	`datetime.now().strftime('%F')`

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