cumulative sum in python
import pandas as pd import numpy as np # Create a dataframe df1 = pd.DataFrame({"A":[None, 3, 8, 14], "B":[1, None, 4, 3], "C":[5, 3, 9,None]}) # Computing sum over Index axis print(df1.cumsum(axis = 0, skipna = True)) #skipna exclude null values