# randomize the lines in a file
# input file is list.txt, output file is listu.txt
# Matt Bishop, March 1, 2012
# ECS 10, Winter 2012
import random

#
# open the file and read in the lines
#
f = open("list.txt", "r")
flines = f.readlines()
num = len(flines)

#
#randomize the order of the lines
# doing it num times is probably overkill!
#
for i in range(num):
    line1 = random.randrange(num)
    line2 = random.randrange(num)
    flines[line1], flines[line2] = flines[line2], flines[line1]

#
# now write out the lines
#
g = open("listu.txt", "w")
g.writelines(flines)

#
# clean up and quit
#
f.close()
g.close()