from multiprocessing import Process
import os
import time
def long_time_task(n):
    print('子进程: {} - 任务{}'.format(os.getpid(), n))
    time.sleep(2)
    # 主要计算任务
    print("结果: {}".format(10 ** 200))

print('当前主进程: {}'.format(os.getpid()))

start = time.time()
# 创建子进程
p1 = Process(target=long_time_task, args=(1,))
p2 = Process(target=long_time_task, args=(2,))

# 开始执行子进程
p1.start()
p2.start()

print('等待所有⼦子进程完成。')
p1.join()
p2.join()
end = time.time()
running_time = end - start
print("总共⽤用时{}秒".format(running_time))