Python实现多任务（协程、线程、进程）

不念不忘少年蓝@ 2022-12-31 02:28 266阅读 0赞

### Python实现多任务 ###

*  1.多任务-协程
 *  2.多任务-线程
 *  3.多任务-进程

# 1.多任务-协程 #

from gevent import monkey
    import gevent
    import urllib.request
    
    monkey.patch_all()
    
    def my_download(url):
        print('GET:%s' % url)
        resp = urllib.request.urlopen(url)
        data = resp.read()
        print('%d bytes recived from: %s' % (len(data), url))
    
    
    gevent.joinall([
        gevent.spawn(my_download, 'http://www.baidu.com/'),
        gevent.spawn(my_download, 'http://www.itcast.cn/'),
        gevent.spawn(my_download, 'http://www.itheima.com')
    ])

# 2.多任务-线程 #

"""
    线程：多任务版UDP聊天器
    """
    import socket
    import threading
    
    
    def send_msg(udp_socket):
        """获取键盘数据并发送给对方"""
        while True:
            msg = input("\n请输入要发送的数据：")
            dest_ip = input("\n请输入对方的ip地址：")
            dest_port = int(input("\n请输入对方的port:"))
            udp_socket.sendto(msg.encode("utf-8"), (dest_ip, dest_port))
    
    
    def recv_msg(udp_scoket):
        """接受数据并显示"""
        while True:
            recv_msg = udp_scoket.recvfrom(1024)
            recv_ip = recv_msg[1]
            recv_msg = recv_msg[0].decode('utf-8')
            print(">>>%s: %s" % (str(recv_ip), recv_msg))
    
    
    def main():
        udp_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        udp_socket.bind(("", 7890))
        t = threading.Thread(target=recv_msg, args=(udp_socket,))
        t.start()
        send_msg(udp_socket)
    
    
    if __name__ == "__main__":
        main()

# 3.多任务-进程 #

import multiprocessing
    import os
    import time
    import random
    
    
    def copy_file(queue, file_name,source_folder_name,  dest_folder_name):
        """copy文件到指定的路径"""
        f_read = open(source_folder_name + "/" + file_name, "rb")
        f_write = open(dest_folder_name + "/" + file_name, "wb")
        while True:
            time.sleep(random.random())
            content = f_read.read(1024)
            if content:
                f_write.write(content)
            else:
                break
        f_read.close()
        f_write.close()
    
        # 发送已经拷贝完毕的文件名字
        queue.put(file_name)
    
    
    def main():
        # 获取要复制的文件夹
        source_folder_name = input("请输入要复制文件夹名字:")
    
        # 整理目标文件夹
        dest_folder_name = source_folder_name + "[副本]"
    
        # 创建目标文件夹
        try:
            os.mkdir(dest_folder_name)
        except:
            pass  # 如果文件夹已经存在，那么创建会失败
    
        # 获取这个文件夹中所有的普通文件名
        file_names = os.listdir(source_folder_name)
    
        # 创建Queue
        queue = multiprocessing.Manager().Queue()
    
        # 创建进程池
        pool = multiprocessing.Pool(3)
    
        for file_name in file_names:
            # 向进程池中添加任务
            pool.apply_async(copy_file, args=(queue, file_name, source_folder_name, dest_folder_name))
    
        # 主进程显示进度
        pool.close()
    
        all_file_num = len(file_names)
        while True:
            file_name = queue.get()
            if file_name in file_names:
                file_names.remove(file_name)
    
            copy_rate = (all_file_num-len(file_names))*100/all_file_num
            print("\r%.2f...(%s)" % (copy_rate, file_name) + " "*50, end="")
            if copy_rate >= 100:
                break
        print()
    
    
    if __name__ == "__main__":
        main()