我有两个csv文件:
CSV1:
Mobile_Number Date
503477334 2018-10-12
506002884 2018-10-12
501022162 2018-10-12
503487338 2018-10-13
506012887 2018-10-13
503427339 2018-10-14
CSV2:
Date Mobile_Number
2018-10-01 503477334
2018-10-06 501022162
2018-10-08 506002884
2018-10-09 503487338
2018-10-13 506012887
2018-10-14 503427492
现在。我想要如下所示的输出,其中有一个新列,指示 csv1 中数字出现日期之间的差异,如果数字存在于 csv2 中
CSV1:
Mobile_Number Date Difference
503477334 2018-10-12 11
506002884 2018-10-12 4
501022162 2018-10-12 6
503487338 2018-10-13 4
506012887 2018-10-13 0
503427339 2018-10-14 NaN
在列Date
中使用Series.map
减法,然后按Series.dt.days
转换时间增量:
df1['Date'] = pd.to_datetime(df1['Date'])
df2['Date'] = pd.to_datetime(df2['Date'])
s1 = df2.drop_duplicates('Mobile_Number').set_index('Mobile_Number')['Date']
df1['Difference'] = df1['Date'].sub(df1['Mobile_Number'].map(s1)).dt.days
print (df1)
Mobile_Number Date Difference
0 503477334 2018-10-12 11.0
1 506002884 2018-10-12 4.0
2 501022162 2018-10-12 6.0
3 503487338 2018-10-13 4.0
4 506012887 2018-10-13 0.0
5 503427339 2018-10-14 NaN