get_latest.py

#!/usr/bin/env python
# -*- coding: utf-8

import os
from threading import Timer


last_file = None


def file_modified(name1, name2):
    time1 = os.path.getmtime(name1)
    time2 = os.path.getmtime(name2)
    result = 0
    if time1 > time2:
        result = 1
    elif time1 < time2:
        result = -1
    return result


def try_read():
    os.chdir('/home/uranusjr/Pictures')
    ok_file_exists = os.path.exists('OK')
    if ok_file_exists:
        os.remove('OK')
        file_list = sorted(os.listdir('.'), cmp=file_modified, reverse=True)

        global last_file
        if last_file != file_list[0]:   # Has new file
            print 'New file!!', file_list[0]
            last_file = file_list[0]

    timer = Timer(1.0, try_read)
    timer.start()


def main():
    try_read()


if __name__ == '__main__':
    main()