from socket import *
import time

s = socket()
s.bind(('127.0.0.1',8080))
s.listen(5)
s.setblocking(False)

r_list=[]
w_list=[]
while True:
    try:
        conn, addr = s.accept()
        r_list.append(conn)

    except BlockingIOError:
        # time.sleep(0.05)
        print('可以去干其他的活了')
        print('rlist: ',len(r_list))

        # 收消息
        del_rlist=[]
        for conn in r_list:
            try:
                data=conn.recv(1024)
                if not data:
                    conn.close()
                    del_rlist.append(conn)
                    continue
                # conn.send(data.upper())
                w_list.append((conn,data.upper()))
            except BlockingIOError:
                continue
            except ConnectionResetError:
                conn.close()
                # r_list.remove(conn)
                del_rlist.append(conn)

        # 发消息
        del_wlist=[]
        for item in w_list:
            try:
                conn=item[0]
                res=item[1]
                conn.send(res)
                del_wlist.append(item)
            except BlockingIOError:
                continue
            except ConnectionResetError:
                conn.close()
                del_wlist.append(item)

        # 回收无用连接
        for conn in del_rlist:
            r_list.remove(conn)

        for item in del_wlist:
            w_list.remove(item)

from socket import *
import os

client = socket()
client.connect(('127.0.0.1', 8080))

while True:
    data='%s say hello' %os.getpid()
    client.send(data.encode('utf-8'))
    res=client.recv(1024)
    print(res.decode('utf-8'))