tail -f when multi file

faketail.py

import sys
import os
import time

MAX_INTERVAL = 1.0


class Poller:

    def __init__(self, files):
        self.kv = {}
        self.now = None
        for filename in files:
            _f = open(filename)
            _f.read()
            stat = os.stat(filename)
            self.kv[filename] = {'file': _f, 'position': _f.seek(stat[6])}

    def run_forever(self):
        while True:
            for obj in self.kv:
                fp = self.kv[obj]['file']
                where = fp.tell()
                lines = fp.readlines()
                if not lines:
                    fp.seek(where)
                    time.sleep(MAX_INTERVAL)
                else:
                    if self.now != fp.name:
                        print "\n==> %s <==" % fp.name
                        self.now = fp.name
                    print "".join(lines),

if __name__ == "__main__":
    p = Poller(sys.argv[1:])
    try:
        p.run_forever()
    except KeyboardInterrupt:
        sys.exit(0)