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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
`@@ -356,6 +356,12 @@ datetime.now().strftime('%F')`
`356`	`356`	`df.loc[~df['apply_date'].isna(),'apply_month'] = \`
`357`	`357`	`df.loc[~df['apply_date'].isna(),'apply_date'].map(lambda x: x.strftime('%Y年-%m月'))`
`358`	`358`
	`359`	`+# 八位数字转日期格式`
	`360`	`+from dateutil.parser import parse`
	`361`	`+a=20190613`
	`362`	`+b=str(a)`
	`363`	`+c=parse(b)`
	`364`	`+`
`359`	`365`	`# Time`
`360`	`366`	`df['weekday'] = df['starttime'].apply(lambda s : s.weekday()) # Monday is 0 and Sunday is 6`
`361`	`367`	`df['hour'] = df['starttime'].apply(lambda s : s.hour)`

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