Get the diff of the two sorted sequence stored in files.

diff.py

import sys

if __name__ == '__main__':
    file1, file2 = sys.argv[1:]

    file1_fd = open(file1)
    file2_fd = open(file2)

    line1 = file1_fd.readline()
    line2 = file2_fd.readline()

    while line1 and line2:
        if line1 == line2:
            line1 = file1_fd.readline()
            line2 = file2_fd.readline()
        elif line1 < line2:
            print line1.strip()
            line1 = file1_fd.readline()
        else:
            print line2.strip()
            line2 = file2_fd.readline()

    while line1:
        print line1.strip()
        line1 = file1_fd.readline()

    while line2:
        print line2.strip()
        line2 = file2_fd.readline()