python array elimination

eliminate.py

#!/bin/env python

import sys

input=int(sys.argv[1])+1
array=range(1,input)

print array

def remove_left(myarray):
    return myarray[1::2]

def remove_right(myarray):
    myarray=myarray[-2::-2]
    if len(myarray) > 1:
        myarray.reverse()
    return myarray


while len(array) > 1:
    array=remove_left(array)
    print array
    if len(array) > 1:
        array=remove_right(array)
        print array