How to multiply iteratively down a column?

Question

I am having a tough time with this one - not sure why...maybe it\'s the late hour.

I have a dataframe in pandas as follows:

1     10
2     11
3     20
4          


        

Answer 1

Use cumprod.

Example:

df = pd.DataFrame({'A': [10, 11, 20, 5, 10]}, index=range(1, 6))
df['cprod'] = df['A'].cumprod()