python socket编程(socket)

代码如下：

server端：

import socket
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
host=socket.gethostname()
port=1234
s.bind((host,port))
s.listen(5)
while True:
    c,addr=s.accept()
    print("got connecion from:",addr)
    while True:
        msg=c.recv(1024).decode()
        print("msg:",msg)
        if not msg:
            break
        data="hello"
        c.send(data.encode("utf-8"))
    c.close()


client端：

import socket

host="server_name or ip"
port=1234
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect((host,port))
while True:
    data=input("please input:")
    if not data:
        break
    s.send(data.encode("utf-8"))
    msg=s.recv(1024).decode()
    if not msg:
        break
    print(msg)
s.close()

注意点：
1.port最好用大于1024的值。
2.client中的host要用server的IP或者主机名
3.数据的编码解码

可能报错及分析
1.ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it
原因分析：服务器未启动

2.ConnectionResetError:  [WinError 10054] An existing connection was forcibly closed by the remote host
原因分析： 服务器突然关掉了

3. ConnectionAbortError:  [WinError 10053] An established connection was aborted by the sofeware in youor host machine
原因分析：server端的代码在接收一个msg，发送一个data后就关闭了connection。应该在程序中加while循环，让不断的发送和接收

4.OsError: [WinError 10049] The requested address is not valid in its context
原因分析：代码中服务器hostname不对