我有一个数据帧,如下所示:
Date_1 Date_2
0 5 Dec 2017 5 Dec 2017
1 14 Dec 2017 14 Dec 2017
2 15 Dec 2017 15 Dec 2017
3 18 Dec 2017 21 Dec 2017 18 Dec 2017 21 Dec 2017
4 22 Dec 2017 22 Dec 2017
要检查的条件:
我正在尝试执行以下相同操作:
df['Date_1'] = pd.to_datetime(df['Date_1'], format='%d %b %Y')
但是出现以下错误:
ValueError: unconverted data remains:
预期输出:
Date_1 Date_2
0 5 Dec 2017 5 Dec 2017
1 14 Dec 2017 14 Dec 2017
2 15 Dec 2017 15 Dec 2017
3 18 Dec 2017 18 Dec 2017
4 21 Dec 2017 21 Dec 2017
5 22 Dec 2017 22 Dec 2017
答案 0 :(得分:4)
将正则表达式与findall
一起使用后,您的问题就变成了unnesting
问题
s=df.apply(lambda x : x.str.findall(r'((?:\d{,2}\s)?(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[a-z]*(?:-|\.|\s|,)\s?\d{,2}[a-z]*(?:-|,|\s)?\s?\d{,4})'))
unnesting(s,['Date_1','Date_2']).apply(pd.to_datetime)
Out[82]:
Date_1 Date_2
0 2017-12-05 2017-12-05
1 2017-12-14 2017-12-14
2 2017-12-15 2017-12-15
3 2017-12-18 2017-12-18
3 2017-12-21 2017-12-21
4 2017-12-22 2017-12-22