#server.py
import threading
import time
def dealClient(sock, addr):
    #第四步：接收传来的数据，并发送给对方数据
    print(('Accept new connection from %s:%s...' % addr))
    sock.send(b'Hello,I am server!')
    while True:
        data = sock.recv(1024)
        time.sleep(1)
        if not data or data.decode('utf-8') == 'exit':
            break
        print('-->>%s!' % data.decode('utf-8'))
        sock.send(('Loop_Msg: %s!' % data.decode('utf-8')).encode('utf-8'))
    #第五步：关闭套接字
    sock.close()
    print(('Connection from %s:%s closed.' % addr))
if __name__=="__main__":
    #第一步：创建一个基于IPv4和TCP协议的Socket
    # 套接字绑定的IP(127.0.0.1为本机ip)与端口
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.bind(('127.0.0.1', 8081))
    #第二步:监听连接
    s.listen(5)
    print('Waiting for connection...')
    while True:
        # 第三步:接受一个新连接:
        sock, addr = s.accept()
        # 创建新线程来处理TCP连接:
        t = threading.Thread(target=dealClient, args=(sock, addr))
        t.start()

#client.py
import socket
#初始化Socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
#连接目标的ip和端口
s.connect(('127.0.0.1', 8081))
# 接收消息
print(('-->>'+s.recv(1024).decode('utf-8')))
# 发送消息
s.send(b'Hello,I am a client')
print(('-->>'+s.recv(1024).decode('utf-8')))
s.send(b'exit')
#关闭套接字
s.close()

[x@PC PyProject]$ python server.py
Waiting for connection...
Accept new connection from 127.0.0.1:54616...
-->>Hello,I am a client!
Connection from 127.0.0.1:54616 closed.

[x@PC PyProject]$ python client.py
-->>Hello,I am server!
-->>Loop_Msg: Hello,I am a client!

#coding:utf-8
import socket
#创建Socket，绑定指定的ip和端口
#SOCK_DGRAM指定了这个Socket的类型是UDP。绑定端口和TCP一样。
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('127.0.0.1', 8081))
print('Bind UDP on 8081...')
while True:
    # 直接发送数据和接收数据
    data, addr = s.recvfrom(1024)
    print(('Received from %s:%s.' % addr))
    s.sendto(b'Hello, %s!' % data, addr)

#coding:utf-8
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
for data in [b'Hello', b'World']:
    s.sendto(data, ('127.0.0.1', 8081))
    print(s.recv(1024).decode('utf-8'))
s.close()

server:
[x@PC PyProject]$ python untitled.py
Bind UDP on 9999...
Received from 127.0.0.1:50603.
Received from 127.0.0.1:50603.

client:
[x@PC PyProject]$ python untitled1.py
Hello, Hello!
Hello, World!