python - 从上一行/值 python 添加值

Question

是否可以像这样用之前在 Python 中定义的数字的值从每一行添加值:

base_value = 10

a b c
2 3 (expected. 2+3+base_value=10)
4 3 (expected. 4+3+15=22)
1 9 (expected. 1+9+22=32)
5 7 (expected. 5+7+32=44)
1 1 (expected. 1+1+44=46)
... 

提前致谢

Answer 1

使用Series.add与 Series.cumsum :

base_value = 10
df['c'] = df['a'].add(df['b']).cumsum().add(base_value)

print (df)
   a  b   c
0  2  3  15
1  4  3  22
2  1  9  32
3  5  7  44
4  1  1  46