2022-04-11 - Python multiprocessing subprocess 模块区别

Posted 2023-04-11

参考技术A

multiprocessing和subprocess都是对操作系统底层多进程api的封装：

multiprocessing:

subprocess:

multiprocessing创造的进程 必须用于执行若干个（若干段）python脚本 ，它 完全类似threading模块，只是是进程级别的
subprocess则创造了简单的普通进程，并提供了完整的与输入、输出、错误流交互的api，可以获取进程的返回码

使用multiprocessing：

使用subprocess：

python 列出具有multi和sum.py的压缩

def compress_list_multi(list): #multiplies the first half of a list by the indexes in the second half.
	midpoint = (len(list) / 2)
	one, two = list[0:midpoint], list[midpoint:len(list)]
	return [one[i]*two[i] for i in range(len(one))]
def compress_list_sum(list):
	midpoint = (len(list) / 2)
	one, two = list[0:midpoint], list[midpoint:len(list)]
	return [one[i]+two[i] for i in range(len(one))]
def compress_all_multi(list): #reduces a list to a single entry by multiplying all items.
	while len(list) > 1:
		midpoint = (len(list) / 2)
		one, two = list[0:midpoint], list[midpoint:len(list)]
		list = [one[i]*two[i] for i in range(len(one))]
	return list
def compress_all_sum(list): #reduces a list to a single enty by adding all items. 
	while len(list) > 1:
		midpoint = (len(list) / 2)
		one, two = list[0:midpoint], list[midpoint:len(list)]
		list = [one[i]+two[i] for i in range(len(one))]
	return list