实现简单的类似nc的功能，连接echo服务端使用

echo_client.py

#!/usr/bin/env python3

'''
    An easy socket client
    Author:KosWu
'''

import socket
import argparse

BUFFSIZE = 1024

def main():
    #解析参数
    parser = argparse.ArgumentParser()
    parser.add_argument('address', help='remote IP of the server')
    parser.add_argument('-p', '--port', help='connect port of the server', type = int, default = 10007)
    args = parser.parse_args()
    port = args.port
    if port not in range(1, 65535):
        raise Exception("Port is out of range.")
    addr = (args.address, args.port)
    #连接对方,使用IPV4,TCP连接
    tcpSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    tcpSocket.connect(addr)
    tcpSocket.settimeout(5)
    try:
        while True:
            #从标准输入获取数据
            send_data = input()
            if send_data == "":
                continue
            tcpSocket.send(bytes(send_data, encoding = 'utf-8'))
            recv_data = tcpSocket.recv(BUFFSIZE)
            recv_data = str(recv_data, encoding = 'utf-8')
            print(recv_data)
    except KeyboardInterrupt:
        print ("Bye")
    except Exception as err:
        print(err)
    tcpSocket.close()


if __name__ == '__main__':
    main()