# settings.py

HOST = ‘localhost‘
PORT = 5555
buffersize = 1024
ADDR = HOST, PORT

# poll_server.py

from settings import *
from select import *
from socket import *

s = socket()
s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)  # 设置端口可立即重用
s.bind(ADDR)
s.listen()

# 创建poll对象
p = poll()

# 创建地图（字典）
fdmap = {s.fileno(): s}

# 注册关注（事件）
p.register(s, POLLIN | POLLERR)
# POLLIN 对应select方法中的参数rlist         -> 等待处理的IO事件
# POLLOUT 对应select方法中的参数wlist     -> 主动处理的IO事件
# POLLERR 对应select方法中的参数xlist        -> 出错处理的IO事件

while True:
    # 进行IO监控
    # events = [(fileno, event), ...]
    try:
        events = p.poll()
    except KeyboardInterrupt:
        print(‘KeyboardInterrupt: Ctrl+C to exit‘)
        break

    for fd, event in events:
        if fd == s.fileno():
            # 从地图中找到fd对应的对象
            conn, addr = fdmap[fd].accept()
            print(‘Connect from‘, addr)
            # 注册关注
            p.register(conn, POLLIN)
            # 添加到地图中
            fdmap[conn.fileno()] = conn
        else:
            data = fdmap[fd].recv(buffersize)
            if not data:
                p.unregister(fd)  # 取消注册
                fdmap[fd].close()  # 关闭套接字
                del fdmap[fd]  # 从地图中删除
            else:
                print(fdmap[fd].getpeername(), data.decode())
                fdmap[fd].send(b‘Roger that!‘)
s.close()
print(‘El Fin‘)        

# client.py

from socket import *
from settings import *

s = socket()
s.connect(ADDR)

while True:
    data = input(‘>> ‘)
    if not data:
        break
    s.send(data.encode())
    print(s.recv(buffersize).decode())

s.close()