循环线程

引入   import threading模块
……
if __name__ == "__main__":

# 创建数组存放线程
threads = []
# 创建10个线程
for i in range (10):
    # 针对函数创建线程

    t = threading.Thread (target=test_func, args=())
    # 把创建的线程加入线程组
    threads.append (t)

# 启动线程（记法一）
# for t in threads:
#     t.setDaemon (True)
#     t.start ()
#     t.join ()
# 启动线程（记法二）
for i in threads:
    i.start ()
    # keep thread
for i in threads:
    i.join ()