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如下所示：

									# coding=utf-8

									import signal

									import time

									def set_timeout(num, callback):

									  def wrap(func):

									    def handle(signum, frame): # 收到信號 SIGALRM 后的回調函數，第一個參數是信號的數字，第二個參數是the interrupted stack frame.

									      raise RuntimeError

									    def to_do(*args, **kwargs):

									      try:

									        signal.signal(signal.SIGALRM, handle) # 設置信號和回調函數

									        signal.alarm(num) # 設置 num 秒的鬧鐘

									        print 'start alarm signal.'

									        r = func(*args, **kwargs)

									        print 'close alarm signal.'

									        signal.alarm(0) # 關閉鬧鐘

									        return r

									      except RuntimeError as e:

									        callback()

									    return to_do

									  return wrap

									if __name__ == '__main__':

									  def after_timeout(): # 超時后的處理函數

									    print "do something after timeout."

									  @set_timeout(2, after_timeout) # 限時 2 秒

									  def connect(): # 要執行的函數

									    time.sleep(1) # 函數執行時間，寫大于2的值，可測試超時

									    return 'connect success.'

									  print connect()