Binomial Theorem.py

#!/usr/bin/env python

import math,os,sys

def clear():
	os.system('cls' if os.name=='nt' else 'clear')

def init():
	clear()
	print "Binomial Theorem\n"
	print "(aX^b+cY^d)^e"

def get_int(prompt):
	print prompt
	result = 0
	while result == 0:
		try:
			result = input("> ")
		except NameError:
			pass
	return result

def get_str(prompt):
	print prompt
	result = raw_input("> ")
	return result

def create_variable(letter):
	co = get_int("Enter Coefficient On %s" % letter.upper())
	exp = get_int("Enter Exponent On %s" % letter.upper())
	return (co, exp)
	
def nCr(n,r):
	f = math.factorial
	return f(n)/(f(n-r)*f(r))
	
def gen_term(x,y,degree,t):
	t = t-1
	coefficient = nCr(degree,t)
	xpower = degree-t
	ypower = t
	xcoefficient = x[0]**xpower
	xexponent = x[1]*xpower
	ycoefficient = y[0]**ypower
	yexponent = y[1]*ypower
	total_coefficient = coefficient*xcoefficient*ycoefficient
	result = ""
	if total_coefficient == 0:
		result = "0"
		return result
	elif total_coefficient > 1:
		result = "(%s)" % total_coefficient
	
	if xexponent == 1:
		result = "%s(X)" % result
	elif xexponent > 1:
		result = "%s(X^%d)" % (result,xexponent)
	if yexponent == 1:
		result = "%s(Y)" % result
	elif yexponent > 1:
		result = "%s(Y^%d)" % (result,yexponent)
	
	return 	result

def format_binomial(x,y,degree):
	result = "("
	if x[0] != 0 and x[1] != 0:
		if x[0] != 1:
			result = "%s%dX" % (result,x[0])
		else:
			result = "%sX" % (result)
		if x[1] != 1:
			result = "%s^%d" % (result,x[1])
	result = "%s + " % result
	if y[0] != 0 and y[1] != 0:
		if y[0] != 1:
			result = "%s%dY" % (result,y[0])
		else:
			result = "%sY" % (result)
		if y[1] != 1:
			result = "%s^%d" % (result,y[1])
	result = "%s)" % result	
	if degree > 1:
		result = "%s^%d" % (result,degree)
	return result
def main():
	init()
	if len(sys.argv) == 6:
		x = (int(sys.argv[1]),int(sys.argv[2]))
		y = (int(sys.argv[3]),int(sys.argv[4]))
		degree = int(sys.argv[5])
	else:
		x = create_variable("X")
		y = create_variable("Y")
		degree = get_int("Enter Degree")
	print
	print format_binomial(x,y,degree),"=",
	for t in range(1,degree+2):
		print gen_term(x,y,degree,t),
		if t != degree+1:
			print "+",
			
if __name__ == '__main__':
    main()

Without the function