server.py

import socketip_port = ('127.0.0.1',9999)sk = socket.socket()sk.bind(ip_port)sk.listen(5)while True:    # 服务端阻塞，等待客户端请求	conn,addr = sk.accept()	# 2.7 sendall(str)	# 3.5 sendall(bytes)		# 欢迎登陆 =》\xe6\xac\xa2\xe8\xbf\x8e\xe7\x99\xbb\xe9\x99\x86	# bytes('欢迎登陆', 'utf-8')    conn.sendall(bytes('欢迎登陆', 'utf-8'))	    while True:        client_data = conn.recv(1024)        if not client_data:            break        reply = str(client_data, 'utf-8')        conn.sendall(bytes(reply, 'utf-8'))    conn.close()

client.py

import socketip_port = ('127.0.0.1', 9999)sk = socket.socket()sk.connect(ip_port)while True:    # recv返回值=字节类型	server_reply_bytes = sk.recv(1024)    #\xe6\xac\xa2\xe8\xbf\x8e\xe7\x99\xbb\xe9\x99\x86	# 字符串 = str(字节, 'utf-8')	reply_str = str(server_reply_bytes, 'utf-8')	# reply_str="欢迎登录"	print(reply_str)		# 字符串->字节   bytes(字符串，'utf-8')	# 字节 -> 字符串 str(字节，'utf-8')	    inp = input("input:")       sk.sendall(bytes(inp, 'utf-8'))sk.close()