Descargarmonica85concrack
- wistcomrenasupka
- May 15, 2022
- 1 min read

January 15, 2020 
I want to get the date (when it is first seen) 
the date of the last seen.
I tried :
df[0]
df['First Seen'].max()
but nothing.
A:
I think need compare by first column and first max value per group, aggregate DateFrame.first_valid_index, but maybe is better create GroupBy.first, so working solution is:
df1 = df.groupby('User ID', group_keys=False).first()
print (df1)
                                              Date           User ID
0                                      2019-10-01             1029
1                                      2019-10-01             1029
2                                      2019-10-01             1029
3                                      2019-10-01             1029
4                                      2019-10-01             1029
5  ac619d1d87
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