报错如下：module ‘time’ has no attribute ‘clock’
原因：
time.clock（）已经在新的版本中移除了。在Python3.8中更新了。
“The function time.clock() has been removed, after having been deprecated since Python 3.3: use time.perf_counter() or time.process_time() instead, depending on your requirements, to have well-defined behavior. (Contributed by Matthias Bussonnier in bpo-36895.)”
解决方案：
把time.clock()改为time.perf_counter()或者time.process_time()