# 不加锁:并发执行,速度快,数据不安全 from threading import current_thread, Thread, Lock import os, time n = 100 def task(): global n print(‘%s is running‘ % current_thread().getName()) temp = n time.sleep(0.5) n = temp - 1 if __name__ == ‘__main__‘: lock = Lock() threads = [] start_time = time.time() for i in range(5): t = Thread(target=task) threads.append(t) t.start() for t in threads: t.join() stop_time = time.time() print(‘主:%s n:%s‘ % (stop_time - start_time, n))
macname@MacdeMacBook-Pro py % python3 cccccc.py Thread-1 is running Thread-2 is running Thread-3 is running Thread-4 is running Thread-5 is running 主:0.503460168838501 n:99 macname@MacdeMacBook-Pro py %
原文：https://www.cnblogs.com/sea-stream/p/14192789.html