selectors 模块

server.py

import socket
import selectors

sel = selectors.DefaultSelector()  # 创建selectors对象，它会自动根据操作系统选择使用select,pool 还是epool


def accept(sock, mask):
    conn, addr = sock.accept()
    print('accepted', conn, 'from', addr)
    conn.setblocking(False)
    sel.register(conn, selectors.EVENT_READ, read)


def read(conn, mask):
　　try:
    　　data = conn.recv(1000)
    　　if not data:
　　　　　　 raise Exception
        print('echoing', repr(data), 'to', conn)
        conn.send(data)
    except Exception as e:
        print('closing', conn)
        sel.unregister()
        conn.close()


sock = socket.socket()
sock.bind(('localhost', 8080))
sock.listen(100)
sock.setblocking(False)
sel.register(sock, selectors.EVENT_READ, accept)  # 将sock对象跟accept做一个绑定，只要有sock对象有活动，就直接调用accept方法

while True:
    events = sel.select()  # 使用selectors对象进行监听
    for key, mask in events:  #
        callback = key.data
        callback(key.fileobj, mask)

client.py

import socket

sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sk.connect(('localhost', 8080))
while True:
    inp = input('>>').strip()
    sk.sendall(inp.encode('utf-8'))
    data = sk.recv(1024)
    print(data.decode('utf-8'))