I have the following dataframe:
date forecast_price pool_price forecast_ail ail
1 2019-09-03 11:00:00 34.90 35.5 9964 9970
2 2019-09-03 12:00:00 34.95 36.6 10074 10078
3 2019-09-03 13:00:00 34.94 37.7 10130 10135
4 2019-09-03 14:00:00 50.90 NaN 9000 NaN
5 2019-09-03 15:00:00 60.95 NaN 10000 NaN
6 2019-09-03 16:00:00 70.94 NaN 12000 NaN
I would like to copy the contents of rows 1 to 3 onto rows 3 to 6, but I'd like to leave the forecast_price and forecast_ail column values the same for rows 4 to 6. How do I go about doing so?
Expected output:
date forecast_price pool_price forecast_ail ail
1 2019-09-03 11:00:00 34.90 35.5 9964 9970
2 2019-09-03 12:00:00 34.95 36.6 10074 10078
3 2019-09-03 13:00:00 34.94 37.7 10130 10135
4 2019-09-03 14:00:00 50.90 35.5 9000 9970
5 2019-09-03 15:00:00 60.95 36.6 10000 10078
6 2019-09-03 16:00:00 70.94 37.7 12000 10135
I guess you meant to copy in rows 4 to 6
You can use:
df.loc[[4,5,6],['pool_price','ail']]=df.loc[[1,2,3],['pool_price','ail']]
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