这是更正的版本：
from __future__ import print_function
from threading import Timer
def hello():
print("Hello World!")
class RepeatingTimer(object):
def __init__(self, interval, f, *args, **kwargs):
self.interval = interval
self.f = f
self.args = args
self.kwargs = kwargs
self.timer = None
def callback(self):
self.f(*self.args, **self.kwargs)
self.start()
def cancel(self):
self.timer.cancel()
def start(self):
self.timer = Timer(self.interval, self.callback)
self.timer.start()
t = RepeatingTimer(3, hello)
t.start()
$ python -i foo.py
>>> Hello World!
>>> Hello World!
>>> t.cancel()
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