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 theprevious call. it works with most python 2.x platforms. the functionuses a simple trick to store a persistent variable (clock) withoutusing a global variable.'''import timedef 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()# exampleif __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。