This is my pandas dataframe.
Status index 2011-01-10 16:00:00 Active 2011-01-11 16:00:00 2011-01-12 16:00:00 Inactive 2011-01-13 16:00:00 2011-01-14 16:00:00 2011-01-18 16:00:00
I would like to fill the blank value of the column 'Status' using previous N row value. The result look like following.
Status index 2011-01-10 16:00:00 Active 2011-01-11 16:00:00 Active 2011-01-12 16:00:00 Inactive 2011-01-13 16:00:00 Inactive 2011-01-14 16:00:00 Inactive 2011-01-18 16:00:00 Inactive
What's the best way to do?
if the rows are already null, then forward fill should be sufficient:
df.ffill()
if the rows are empty string, then replace with np.nan, and forward fill:
df.replace('',np.nan).ffill()
status
index
2011-01-10 16:00:00 Active
2011-01-11 16:00:00 Active
2011-01-12 16:00:00 Inactive
2011-01-13 16:00:00 Inactive
2011-01-14 16:00:00 Inactive
2011-01-18 16:00:00 Inactive
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