python_day10 多线程 协程 IO模型

Posted 2020-10-05

多线程
协程
IO模型

多线程

#线程的PID与主进程PID一致
from threading import Thread
from multiprocessing import Process
import os
def task():
    print(‘%s is running‘ %os.getpid())
if __name__ == ‘__main__‘:
    t1=Thread(target=task,)
    t2=Thread(target=task,)
    # t1=Process(target=task,)
    # t2=Process(target=task,)
    t1.start()
    t2.start()
    print(‘主‘,os.getpid())

#多线程共享一个进程内的资源
from threading import Thread
from multiprocessing import Process
n=100
def work():
    global n
    n=0
if __name__ == ‘__main__‘:
    # p=Process(target=work,)
    # p.start()
    # p.join()
    # print(‘主‘,n)
    t=Thread(target=work,)
    t.start()
    t.join()
    print(‘主‘,n)

#开启线程的两种方式
#开启线程的方式一：使用替换threading模块提供的Thread
from threading import Thread
from multiprocessing import Process
def task():
    print(‘is running‘)
if __name__ == ‘__main__‘:
    t=Thread(target=task,)
    # t=Process(target=task,)
    t.start()
    print(‘主‘)
#开启线程的方式二：自定义类，继承Thread
from threading import Thread
from multiprocessing import Process
class MyThread(Thread):
    def __init__(self,name):
        super().__init__()
        self.name=name
    def run(self):
        print(‘%s is running‘ %self.name)
if __name__ == ‘__main__‘:
    t=MyThread(‘egon‘)
    # t=Process(target=task,)
    t.start()
    print(‘主‘)

#多线程共享同一进程内地址空间的练习
#三个任务，一个接收用户输入，一个将用户输入的内容格式化成大写，一个将格式化后的结果存入文件
from threading import Thread
msg_l=[]
format_l=[]
def talk():
    while True:
        msg=input(‘>>: ‘).strip()
        msg_l.append(msg)
def format():
    while True:
        if msg_l:
            data=msg_l.pop()
            format_l.append(data.upper())
def save():
    while True:
        if format_l:
            data=format_l.pop()
            with open(‘db.txt‘,‘a‘) as f:
                f.write(‘%s\n‘ %data)
if __name__ == ‘__main__‘:
    t1=Thread(target=talk)
    t2=Thread(target=format)
    t3=Thread(target=save)
    t1.start()
    t2.start()
    t3.start()

#Thread对象其他相关的属性或方法
from threading import Thread,activeCount,enumerate,current_thread
import time
def task():
    print(‘%s is running‘ %current_thread().getName())
    time.sleep(2)
if __name__ == ‘__main__‘:
    t=Thread(target=task,)
    t.start()
    t.join()
    print(t.is_alive())
    print(t.getName())
    print(enumerate())
    print(‘主‘)
    print(activeCount())

 

协程
IO模型