阻塞IO

服务端

from socket import *
server = socket(AF_INET,SOCK_STREAM)
server.bind(('127.0.0.1',8080))
server.listen(3)
print('server startting...')
while True:
    conn,addr = server.accept()
    print(addr)
    while True:
        try:
            data = conn.recv(1024)
            if not data:break
            conn.send(data.upper())
        except Exception:
            break
    conn.close()
server.close()

客户端
from socket import *
client = socket(AF_INET,SOCK_STREAM)
client.connect(('127.0.0.1',8080))
while True:
    msg = input('p;ease:').strip()
    if not msg:continue
    client.send(msg.encode('utf-8'))
    data = client.recv(1024)
    print(data.decode('utf-8'))