validate that file has finished transferring based on size

gistfile1.py

import os
from datetime import datetime

class FileValidator:
    @staticmethod
    def is_ready(file):
        time_diff = (datetime.now() - datetime.fromtimestamp(os.path.getmtime(file))).seconds
        if time_diff > 2:
            print 'File %s is ready !' % os.path.basename(file)
            return True
        else:
            print 'File %s is not ready yet ..' % os.path.basename(file)
            return False