fileage.py

#!/usr/bin/python

import os
import sys
import time


purpose = "Print the age of a file rounded to the nearest second.\n"
usage = "Usage: " + sys.argv[0] + " <FILENAME>\n"


def fileage(f):
    return int(round(time.time() - os.stat(f).st_mtime))


if __name__ == "__main__":
    try:
        print (fileage(sys.argv[1]))
    except IndexError:
        sys.stderr.write(purpose + "\n" + usage)
        sys.exit(1)