TCP：長連線，安全可靠，一般不會丟包，但是會發生黏包，面向流的傳輸，長度沒有限制，超長的資料包會被拆包傳送

#server.py
import socket
sk = socket.socket()
sk.bind(("127.0.0.1",8080))
sk.listen()

conn,addr = sk.accept()
ret = conn.recv(1024)
print(ret.decode("utf-8"))
conn.send(b"server")

conn.close()
sk.close()
#client.py
import socket
sk = socket.socket()
sk.connect((
 
"127.0.0.1",8080))

sk.send(b"clent")
ret = sk.recv(1024).decode("utf-8")

sk.close()

UDP：短連結，不可靠，會發生丟包，不會黏包，面向訊息，長度有限制，超過限制，超過的部分就不傳送

#server.py
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
sk.bind(("127.0.0.1",8080))

msg,addr = sk.recvfrom(1024)
msg = msg.decode("utf-8")
print
 
(msg)
sk.sendto(b"server",addr)

sk.close()
#client.py
import socket
sk = socket.socket(type=socket.SOCK_DGRAM)
ip_port = ("127.0.0.1",8080)

sk.sendto(b"client",ip_port)

msg,addr = sk.recvfrom(1024)
print(msg.decode("utf-8"))