CODE EXAMPLE FOR PYTHON

pandas shift columns down until value

#We create a shift down method so that we can have all the preious summed values in the bottom index and hence
#deleting them would be easy 
def shift_down(data):
    i=0
    while(i<len(data.columns)):
        while(pd.isnull(data.iloc[len(data.index)-1,i])==True):
            data.iloc[:,i] = data.iloc[:, i].shift(1)
        i+=1
    return data