我有这样的数据框:
A B C D E
0 2 3 4 8 7
1 4 7 5 9 4
2 3 4 5 7 2
3 8 9 1 3 7
我需要做这样的事情:
if 'value in column A' == 2:
'value for this row in new column' = 'value from column B' + 'value from column C'
elif 'value in column A' == 4:
'value for this row in new column' = 'value from column B' + 'value from column D'
elif …