python实现简单的计时器功能函数

本文实例讲述了python实现简单的计时器功能函数。分享给大家供大家参考。具体如下：

此函数通过python实现了一个简单的计时器动能：

    ''' Simple Timing Function.
    This function prints out a message with the elapsed time from the
    previous call. It works with most Python 2.x platforms. The function
    uses a simple trick to store a persistent variable (clock) without
    using a global variable.
    '''
    import time
    def dur( op=None, clock=[time.time()] ):
      if op != None:
        duration = time.time() - clock[0]
        print '%s finished. Duration %.6f seconds.' % (op, duration)
      clock[0] = time.time()
    # Example
    if __name__ == '__main__':
      import array
      dur()  # Initialise the timing clock
      opt1 = array.array('H')
      for i in range(1000):
        for n in range(1000):
          opt1.append(n)
      dur('Array from append')
      opt2 = array.array('H')
      seq = range(1000)
      for i in range(1000):
        opt2.extend(seq)
      dur('Array from list extend')
      opt3 = array.array('H')
      seq = array.array('H', range(1000))
      for i in range(1000):
        opt3.extend(seq)
      dur('Array from array extend')
    # Output:
    # Array from append finished. Duration 0.175320 seconds.
    # Array from list extend finished. Duration 0.068974 seconds.
    # Array from array extend finished. Duration 0.001394 seconds.

希望本文所述对大家的Python程序设计有所帮助。