python如何实现计时？

用python实现计时器功能，代码如下：

''' 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.

import time

print('按下回车开始计时，按下 Ctrl + C 暂停/停止计时。')

while True:

input("")

starttime = time.time()

print('开始')

pausetime=0

while True:

try:

totaltime=int((time.time()-pausetime-starttime))

print('【'+str(int((time.time()-pausetime-starttime)*0.66)),'进郑宏销度】',int((time.time()-pausetime-starttime)/60),'分', int((time.time()-pausetime-starttime)%60), '秒',end='绝厅\r')

time.sleep(1)

except KeyboardInterrupt:

print('【'喊游 + str(int((time.time() -pausetime- starttime) * 0.66)), '进度】', int((time.time()-pausetime - starttime) / 60), '分',

int((time.time() -pausetime- starttime) % 60), '秒', '...暂停中\r\n按回车继续，输入Q停止计时',end='\r')             pausetime_start=time.time()

s=input("")

if s.strip().upper()=='Q':

pausetime_end = time.time()

pausetime = pausetime_end - pausetime_start + pausetime

print('结束')

endtime = time.time()

print('总时间:', round(endtime - pausetime - starttime, 2), '秒 ')

exit(0)

elif s.strip().upper()=='':

pausetime_end=time.time()

pausetime=pausetime_end-pausetime_start+pausetime

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