Creates files with scrambled unique integers

scrambled-integers.py

import sys
from random import shuffle
import argparse


"""
usage:
~ python scrambled-integers.py 1200
1200 scrambled integers written to "1200.txt"
"""

def scrambled(orig):
    dest = orig[:]
    shuffle(dest)
    return dest

def main():
    parser = argparse.ArgumentParser(prog='Creates an scrambled list of integers\nand saves it to a file, one integer per line')
    parser.add_argument('n', help='length of the list', type=int)
    args = parser.parse_args()
    filename = '%s.txt' % args.n
    f = open(filename, 'w+')
    for i in scrambled(range(1, args.n + 1)):
        f.write('%s\n' % i)
    print '%s scrambled integers written to "%s"' % (args.n, filename)

if __name__ == '__main__':
    main()