Slimmed-down tornado's autoreload http://www.tornadoweb.org/documentation/autoreload.html http://siguniang.wordpress.com/2012/08/25/tornado-autoreload/

autoreload.py

# vim: set fileencoding=utf8
from tornado import ioloop
 
import functools
import os
import sys
 
def start(io_loop, check_time=500):
    modify_times = {} # watch list
    callback = functools.partial(_reload_on_update, modify_times)
    scheduler = ioloop.PeriodicCallback(callback, check_time, io_loop=io_loop)
    scheduler.start()
 
def wait():
    io_loop = ioloop.IOLoop()
    start(io_loop)
    io_loop.start()
 
def _reload_on_update(modify_times):
    for module in sys.modules.values():
        path = getattr(module, "__file__", None)
        if not path:
            continue
        if path.endswith(".pyc") or path.endswith(".pyo"):
            path = path[:-1]
        _check_file(modify_times, path)
 
def _check_file(modify_times, path):
    try:
        modified = os.stat(path).st_mtime
    except Exception:
        return
    if path not in modify_times:
        # 起動後1回目の呼び出し
        modify_times[path] = modified
        return
    if modify_times[path] != modified:
        modify_times[path] = modified
        on_modified(path)
 
def on_modified(path):
    # ここにファイル変更時の処理を実装
    print "%s modified"%path
 
if __name__ == '__main__':
    wait()