[英]how to extract part of text using regex on a data frame in pandas
我有一个数据框,其中一列是这样的:
df = index dosage_duration
0 5 years20mg 1X D
1 2 days10mg 1X D
2 2 days10mg 1X D
3 7 weeks
4 2 months
5 3 days
6 1 years5 MG
7 2 years
我要做的是提取时间的第一部分并将其转换为天。 所以结果看起来像这样:
df = index dosage_duration new_dosage
0 5 years20mg 1X D 5*365
1 2 days10mg 1X D 2
2 2 days10mg 1X D 2
3 7 weeks 7*7
4 2 months 2*30
5 3 days 3
6 1 years5 MG 1*365
7 2 years 2*365
正如您在此处看到的,将 5 年转换为 5*365 以作为天数。
我能够得到第一部分,让我们在first row
说5
,在第二行说2
......但我不确定如何获得years
days
或month
,所以我可以将所有值更改为天数。
显然,我需要能够找到space
后的第一个数字,但我不知道该怎么做。
我们试试看:
df = pd.DataFrame({'dosage_duration':['5 years20mg 1x D'
,'2 days10mg 1x D'
,'4 months20mg 1x D'
,'7 weeks'
,'2 months'
,'3 days'
,'1 days'
,'1 years5 MG'
,'2 years'
,'6 months'
,'1 years10 1x D'
,'10 months15']})
nmap={'years':365, 'months':30, 'weeks':7, 'days': 1}
strnmap = '|'.join(nmap.keys())
df_m = df.dosage_duration.str.extract(f'(?P<unit>\d+)\s?(?P<span>[{strnmap}]+)')
df['new_duration']= df_m['unit'].astype(int).mul(df_m['span'].map(nmap))
print(df)
Output:
dosage_duration new_duration
0 5 years20mg 1x D 1825
1 2 days10mg 1x D 2
2 4 months20mg 1x D 120
3 7 weeks 49
4 2 months 60
5 3 days 3
6 1 days 1
7 1 years5 MG 365
8 2 years 730
9 6 months 180
10 1 years10 1x D 365
11 10 months15 300
day
、 week
、 month
、 year
。 仅第一个字母就足以确定要相乘的内容。import pandas as pd
df = pd.DataFrame({'dosage_duration':['5 years27abc','10 days92pqr', '5.5 weeks782364hgsdf', '3 months21647hadjh']})
mul = {
'd':1,
'w':7,
'm':30,
'y':365
}
df['new_dosage'] = df['dosage_duration'].apply(lambda x:x.split()).apply(lambda x:float(x[0])*mul[x[1][0]])
df
Output:
dosage_duration new_dosage
0 5 years27abc 1825
1 10 days92pqr 10
2 5.5 weeks782364hgsdf 35
3 3 months21647hadjh 90
更新:
import pandas as pd
df = pd.DataFrame({'t':['5 years27abc','10 days92pqr', '5 weeks782364hgsdf', '3 months21647hadjh']})
mul = {
'd':'1',
'w':'7',
'm':'30',
'y':'365'
}
df['total_time'] = df['t'].apply(lambda x:x.split()).apply(lambda x:x[0] + '*' + mul[x[1][0]])
df
Output:
t total_time
0 5 years27abc 5*365
1 10 days92pqr 10*1
2 5 weeks782364hgsdf 5*7
3 3 months21647hadjh 3*30
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