同步异步

import time

def func():
time.sleep(3)
print('hello world')

if name == 'main':
res = func() # 同步调用
print('hahaha')

# 第一种

from multiprocessing import Process
import time

def task(name):
print('%s is running'%name)
time.sleep(3)
print('%s is over'%name)

if name == 'main':
# 1 创建一个对象
p = Process(target=task, args=('jason',))
# 容器类型哪怕里面只有1个元素 建议要用逗号隔开
# 2 开启进程
p.start() # 告诉操作系统帮你创建一个进程 异步
print('主')
"""
windows操作系统下 创建进程一定要在main内创建
因为windows下创建进程类似于模块导入的方式
会从上往下依次执行代码
linux中则是直接将代码完整的拷贝一份
"""

# 第二种方式 类的继承

from multiprocessing import Process
import time

class MyProcess(Process):
def run(self):
print('hello bf girl')
time.sleep(1)
print('get out!')

if name == 'main':
p = MyProcess()
p.start()
print('主')

from multiprocessing import Process
import time

def task(name, n):
print('%s is running'%name)
time.sleep(n)
print('%s is over'%name)

if name == 'main':
# p1 = Process(target=task, args=('jason', 1))
# p2 = Process(target=task, args=('egon', 2))
# p3 = Process(target=task, args=('tank', 3))
# start_time = time.time()
# p1.start()
# p2.start()
# p3.start() # 仅仅是告诉操作系统要创建进程
# # time.sleep(50000000000000000000)
# # p.join() # 主进程等待子进程p运行结束之后再继续往后执行
# p1.join()
# p2.join()
# p3.join()
start_time = time.time()
p_list = []
for i in range(1, 4):
p = Process(target=task, args=('子进程%s'%i, i))
p.start()
p_list.append(p)
for p in p_list:
p.join()
print('主', time.time() - start_time)

from multiprocessing import Process

money = 100

def task():
global money # 局部修改全局
money = 666
print('子',money)

if name == 'main':
p = Process(target=task)
p.start()
p.join()
print(money)