Python. Backwards Loops: reversed > xrange > range

looping.py

from random import random
import time

def main():
  list = [] #[5,6,3,6,8,3,10,0,4]
  for i in range(0, 1000000):
    list.append(int( random() * 1000000000 ) )

  with_reversed(list)
  backwards_xrange(list)
  backwards_range(list)
  another_range(list)

""" reversed: (Fastest)"""
def with_reversed(list):
  start_time = time.time()
  profit = 0
  highest = list[-1]

  for a in reversed(list):
    if (highest - a) > profit:
      profit = (highest - a)
    if a > highest:
      highest = a

  print str(with_reversed.__name__) + " total time: "+ str( time.time() - start_time )
  print profit

""" Manually creating a xrange (xrange is faster than range)"""
def backwards_xrange(list):
  start_time = time.time()
  profit = 0
  highest = list[-1]

  for i in xrange(len(list)-1, -1, -1):
    a = list[i]
    if (highest - a) > profit:
      profit = (highest - a)
    if a > highest:
      highest = a

  print str(backwards_xrange.__name__) + " total time: "+ str( time.time() - start_time )
  print profit

""" Manually creating a range. :"""
def backwards_range(list):
  start_time = time.time()
  profit = 0
  highest = list[-1]

  for i in range(len(list)-1, -1, -1):
    a = list[i]
    if (highest - a) > profit:
      profit = (highest - a)
    if a > highest:
      highest = a

  print str(backwards_range.__name__) + " total time: "+ str( time.time() - start_time )
  print profit

""" Manually creating a range and read backwards using len(list): (slowest) """
def another_range(list):
  start_time = time.time()
  profit = 0
  highest = list[-1]

  for i in range(1, len(list) + 1 ):
    a = list[len(list) - i]
    if (highest - a) > profit:
      profit = (highest - a)
    if a > highest:
      highest = a

  print str(another_range.__name__) + " total time: "+ str( time.time() - start_time )
  print profit

if __name__ == '__main__':
  main()