https://www.cnblogs.com/gaidy/p/11156734.html
https://docs.python.org/zh-cn/3.8/library/concurrent.futures.html#
import time
from concurrent.futures import ProcessPoolExecutor
work_count = 5
def seckill():
print(time.time())
with ProcessPoolExecutor(work_count) as pool:
for i in range(work_count):
pool.submit(seckill)