Code fot Fixed Point Iteration in Python

An example that uses this code The Easy Way To Solve Equations In Python.

import math
import sys 

def g(x):
	return math.pow(1-x,1/3.0)
def fpi(x, k):
	for i in range(k):
		print i, x, g(x)
		x = g(x)
	print 'The root is: ',
	return x

def main(argv):
	if (len(sys.argv) != 3):
		sys.exit('Usage: <x> <k>')
	print 'The root is:',
	print fpi(float(sys.argv[1]),int(sys.argv[2]))

if __name__ == "__main__":