# pcj import socket def main():     tcp_server_socket=socket.socket(socket.AF_INET,socket.SOCK_STREAM)     tcp_server_socket.bind(("",9990))     tcp_server_socket.listen(128)     while True:         print("等侍一个客户的连接")         new_client_socket,listen_addr=tcp_server_socket.accept()         print("一个新客户已经连接",listen_addr)         while True:             recv_date=new_client_socket.recv(1024)             if recv_date:    #如recv_date 有数据，就接收，还服务 else break                 print("客户请求的是",recv_date.decode("GBK"))             else:                 break         new_client_socket.send("hello----OK----".encode("gbk"))         new_client_socket.close()     tcp_server_socket.colse() if __name__ == '__main__':     main()