df set value to last row the same as the row before code example
Example: pandas change last row
a.iloc[-1, a.columns.get_loc('a')] = 77
>>> a
a b c
0 1 2 3
1 4 5 6
2 77 8 9a.iloc[-1, a.columns.get_loc('a')] = 77
>>> a
a b c
0 1 2 3
1 4 5 6
2 77 8 9