1.单线程解决并发

方式一

import socket
import select

# 百度创建连接:非阻塞
client1 = socket.socket()
client1.setblocking(False)
try:
    client1.connect(('www.baidu.com', 80))
except BlockingIOError as e:
    pass

# 搜狗创建连接:非阻塞
client2 = socket.socket()
client2.setblocking(False)
try:
    client2.connect(('www.sogou.com', 80))
except BlockingIOError as e:
    pass

# GitHub创建连接:非阻塞
client3 = socket.socket()
client3.setblocking(False)
try:
    client3.connect(('www.github.com', 80))
except BlockingIOError as e:
    pass

# 创建socket列表:socket_list
socket_list = [client1, client2, client3]
# 创建connect列表:conn_list
conn_list = [client1, client2, client3]

while True:
    rlist, wlist, elist = select.select(socket_list, conn_list, [], 0.005)
    # rlist中表示已近获取数据的socket对象
    # wlist中表示已经连接成功的socket对象
    # elist中表示出现错误的socket对象
    for sk in wlist:
        if sk == client1:
            sk.sendall(b'GET /s?wd=alex HTTP/1.0\r\nhost:www.baidu.com\r\n\r\n')
        elif sk == client2:
            sk.sendall(b'GET /web?query=fdf HTTP/1.0\r\nhost:www.sogou.com\r\n\r\n')
        else:
            sk.sendall(b'GET /s?wd=alex HTTP/1.0\r\nhost:www.oldboyedu.com\r\n\r\n')
        conn_list.remove(sk)
    for sk in rlist:
        chunk_list = []
        while True:
            try:
                chunk = sk.recv(8096)
                if not chunk:
                    break
                chunk_list.append(chunk)
            except BlockingIOError as e:
                break
        body = b''.join(chunk_list)
        # print(body.decode('utf-8'))
        print('------------>', body)
        sk.close()
        socket_list.remove(sk)
    if not socket_list:
        breakimport socket
import select

#