用同一列中的以下值填充 Pandas 中的空行

Question

I can see countless posts asking on to fill empty rows with the above value or specific values, but none about filling rows with a value of the same column but below .

I would like to go from this table:

from a table with all lines above 3 filled with 3, and all lines above 2 and below 3 with 2, etc.

Thanks a lot!

EDIT: Found it!

df[col] = df[col].bfill() - as simple as that :)

Answer 1

Try this one:

import pandas as pd
import numpy as np

df = pd.DataFrame([[8, 2, "", 0],
                   [3, 4, "", 1],
                   [5, 3, "", 0],
                   [2, 3, 10, 4]],
                  columns=list("ABCD"))

df= df.replace(to_replace="", method='bfill').values
print(df)