Python-сообщество

#!/usr/bin/python2.7 -tt
import sys
def main():
    number = sys.argv[1]
    power = sys.argv[2]
    result =powr(number, power)
    print str(result)
def powr(a, n):
    if n == 0:
        return 1
    elif n == 1:
        return a
    elif n % 2 == 0:
        result =  powr(a, n/2)
        return result * result
    else:
        result =  powr(a, (n-1)/2)
        return a * result * result
if __name__ == '__main__':
    main()