Solve the coin change problem

coin_change.py

#!/usr/bin/env python
# encoding: utf-8

def change(value, denominations=[0.25, 0.10, 0.05, 0.01]):
    change = {}

    for denomination in denominations:
        change[denomination] = 0
        while value - denomination >= 0:
            change[denomination] += 1
            value -= denomination

    return change

def main():
    print 'Num coins:', change(0.99)

if __name__ == '__main__':
	main()