io多路复用（一）

sever端
 1 import socket
 2 sk1 = socket.socket()
 3 sk1.bind(('127.0.0.1',8001,))
 4 sk1.listen()
 5 
 6 sk2 = socket.socket()
 7 sk2.bind(('127.0.0.1',8002,))
 8 sk2.listen()
 9 
10 sk3 = socket.socket()
11 sk3.bind(('127.0.0.1',8003,))
12 sk3.listen()
13 inputs = [sk1,sk2,sk3]
14 import select
15 while True:
16     # [sk1,sk2,sk3]select内部自动监听sk1,sk2,sk3,三个对象，一旦某个句柄发生变化（accept（））
17     # 如果有链接sk1
18     # r_list = [sk1,sk2]
19     r_list,w_list,e_list = select.select(inputs,[],[],1)
20     for sk in r_list:
21         conn,adress = sk.accept()
22         conn.sendall(bytes('hello',encoding='utf-8'))
23         conn.close()

客户端，可同时连接多个客户端

1 import socket
2 obj = socket.socket()
3 obj.connect(('127.0.0.1',8001,))
4 
5 rec_bytes = obj.recv(1024)
6 rec_str = str(rec_bytes,encoding='utf-8')
7 print(rec_str)
8 obj.close()