我在Pandas数据框“注释文本”中有一列,其中包含这种格式的日期(此处仅显示第一个观察结果):
7/09/2018 11:59:37 AM;12:01:33 PM;00:01:56
添加数据框示例:
df = pd.DataFrame({'Common Text':['7/09/2018 11:59:37 AM;12:01:33 PM;00:01:56', 'Adams Gill Christ 4 Oct 2017 02:52 PM', '4/08/2017 4:30:49 PM ;4:37:23 PM;00:06:34', '5/07/2018 10:14:03 AM ;10:21:35 AM;00:07:31', 'the call was made on 20 Jun 2017\nbut call not found on system', 'Call made on 7/03/2018 8:22:25 AM', 'Review is during 30 May to 1 March 2018']})
但是当我做这样的事情时:
import datefinder
FD = datefinder.find_dates(df['Comment Text'][0])
for dates in FD:
print(dates)
我得到以下结果:
2018-07-09 11:59:37
2019-06-20 12:01:33
2019-06-20 00:01:56
这是不正确的,因为我期望只有2018-07-09
作为结果返回。
答案 0 :(得分:1)
如果我对您的理解正确,并且您的数据始终具有您作为示例显示的两个日期结构。您可以使用正则表达式。
# Make example data
df = pd.DataFrame({'Common Text':['7/09/2018 11:59:37 AM;12:01:33 PM;00:01:56',
'Adams Gill Christ 4 Oct 2017 02:52 PM',
'4/08/2017 4:30:49 PM ;4:37:23 PM;00:06:34',
'5/07/2018 10:14:03 AM ;10:21:35 AM;00:07:31',
'the call was made on 20 Jun 2017\nbut call not found on system']})
Common Text
0 7/09/2018 11:59:37 AM;12:01:33 PM;00:01:56
1 Adams Gill Christ 4 Oct 2017 02:52 PM
2 4/08/2017 4:30:49 PM ;4:37:23 PM;00:06:34
3 5/07/2018 10:14:03 AM ;10:21:35 AM;00:07:31
4 the call was made on 20 Jun 2017\nbut call not...
使用str.extract
。
s = df['Common Text'].str.extract('(.+?(?=\s\d{1,2}:\d{2}:\d{2}))|(\d{1,2}\s[A-Za-z]{3}\s\d{4})')
df['Date'] = s[0].fillna(s[1])
Common Text Date
0 7/09/2018 11:59:37 AM;12:01:33 PM;00:01:56 7/09/2018
1 Adams Gill Christ 4 Oct 2017 02:52 PM 4 Oct 2017
2 4/08/2017 4:30:49 PM ;4:37:23 PM;00:06:34 4/08/2017
3 5/07/2018 10:14:03 AM ;10:21:35 AM;00:07:31 5/07/2018
4 the call was made on 20 Jun 2017\nbut call not... 20 Jun 2017
说明:
(.+?(?=\s\d{1,2}:\d{2}:\d{2}))
:在时间模式99:99:99
(\d{1,2}\s[A-Za-z]{3}\s\d{4})
:提取模式:一个或两个数字,空格,3个字母,空格,4个数字