a simple script to calculate the total amount accumulated over a span of years at a given interest rate and an yearly instalment

compound.py

"""
for a given instalment, interest, and number of years, calculate the compounded amount.
USAGE:

python compound.py instalment interest, years
"""



import sys

def calc(instalment, interest, years):
  amount = instalment

  for i in range(0, years):
    amount = (amount + amount * interest/100.0) + instalment

  return amount


def main(script, instalment, interest, years):
  instalment, interest, years = float(instalment), float(interest), int(years)

  print calc(instalment, interest, years)

if __name__ == '__main__':
  main(*sys.argv)