Day 65 python learning processes TCP and UDP difference

tcp is a link, it must first start the server, and then start the client to the server-based links.

server:

ss = socket () # Creates a server socket
ss.bind () # the address bound to the socket
ss.listen () # monitor link
inf_loop: # server infinite loop
    cs = ss.accept () # to accept the client links
    comm_loop: # communication cycle
        cs.recv () / cs.send () # Dialogue (receive and transmit)
    cs.close () # close the client socket
ss.close () # close the server socket 

client:

 cs = socket () # Create a client socket
 cs.connect () # attempt to connect to the server
 comm_loop: # communication cycle
     cs.send () / cs.recv () # Dialogue (send / receive)
 cs.close () # close the client socket

udp is no link, which end will not start before being given
 server:

ss = socket () # create a server socket
ss.bind () # bind server socket
while True: # server infinite loop
    cs = ss.recvfrom () / ss.sendto () # session (receive and transmit)
ss.close () # close the server socket

Client:

cs = socket () # Create a client socket
while True: # communication cycle
    cs.sendto () / cs.recvfrom () # Dialogue (send / receive)
cs.close () # close the client socket 


UDP instantiated: Server:

import socket
ip_port=('127.0.0.1',9000)
udp_server_client = socket.socket (socket.AF_INET, socket.SOCK_DGRAM)

udp_server_client.bind(ip_port)

while True:
    msg,addr=udp_server_client.recvfrom(1024)
    print(msg,addr)

    udp_server_client.sendto (msg.upper (), addr) 

the UDP instantiated: Client:

from socket import *

udp_cs = socket (AF_INET, SOCK_DGRAM)

while True:
    msg=input('>>: ').strip()
    if not msg:continue
    udp_cs.sendto(msg.encode('utf-8'),('127.0.0.1',9000))
    msg,addr=udp_cs.recvfrom(1024)
    print(msg.decode('utf-8'),addr)