pangrams.txt

The five boxing wizards jump quickly.
Pack my box with five dozen liquor jugs.
Pack my box with five dozen liquor jugs.
Pack my box with five dozen liquor jugs.
Pack my box with five dozen liquor jugs.
A quick brown fox jumps over the lazy dog.
The quick brown fox jumps over the lazy dog.
Pack my red box with five dozen quality jugs.
Pack my red box with five dozen quality jugs.
The quick brown fox jumped over the lazy dogs.
Who packed five dozen old quart jugs in my box?
Who packed five dozen old quart jugs in my box?
Who packed five dozen old quart jugs in my box?
My girl wove six dozen plaid jackets before she quit.
Few black taxis drive up major roads on quiet hazy nights.
A quick movement of the enemy will jeopardize six gunboats.
Who packed five dozen old quart jugs in my box?

uniq.py

import sys

lines = sys.stdin.readlines()
last_line = None
for line in lines:
	if line != last_line:
		sys.stdout.write(line)
	last_line = line

uniq2.py

from itertools import tee, izip

def pairs(iterable):
    "s -> (s0,s1), (s1,s2), (s2, s3), ..."
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)

import sys

lines = sys.stdin.readlines()
sys.stdout.write(lines[0])
for a,b in pairs(lines):
    if a != b:
        sys.stdout.write(b)