Calculate new value based on decreasing value

Question

Problem:

What\'d I like to do is step-by-step reduce a value in a Series by a continuously decreasing base figure.

I\'m not sur

Answer 1

It should work with a while loop :

ii = 0
while (ALLOWANCE > 0 and ii < len(values)):
    if (ALLOWANCE > values[ii]):
        ALLOWANCE -= values[ii]
        values[ii] = 0
    else:
        values[ii] -= ALLOWANCE
        ALLOWANCE = 0
    ii += 1