pythonpandasincrementauto-increment
auto numbering on a date change in dataframe
I would like to get auto incremental number in a data-frame whenever there is a change in a date. Any recommendations please.
I would like the output as attached in screenshot.
Solution
try this:
df['Date'] = pd.to_datetime(df['Date'])
df.assign(SINo=df.groupby('Date').cumcount()+1)
Date SINo
0 2020-10-08 1
1 2020-10-24 1
2 2020-10-24 2
3 2020-10-24 3
4 2020-10-24 4
5 2020-10-31 1
6 2020-11-08 1
7 2020-11-19 1
8 2020-11-24 1
9 2020-11-24 2
10 2020-12-01 1
11 2020-12-05 1
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