#!/usr/bin/python

import random # Random number generators

def randomNumber(minIncl, maxExcl):
  while True:
    yield random.randint(minIncl, maxExcl)

def doubleNumber(generatorForInputs):
  while True:
    yield 2*generatorForInputs.next()

def squareNumber(generatorForInputs):
  while True:
    yield generatorForInputs.next() ** 2

# Here is a very clear pipeline, assembled from parts
rng = randomNumber(1, 1001)
dng = doubleNumber(rng)
sng = squareNumber(dng)

# Prints the square of a doubled random number
print sng.next()
print sng.next()
print sng.next()
print sng.next()