SERVER 
import socket

localIP = "127.0.0.1"
localPort = 20001
bufferSize = 1024
msgFromServer = "Hello UDP Client"
bytesToSend = str.encode(msgFromServer)

UDPServerSocket = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
UDPServerSocket.bind((localIP, localPort))

print("UDP server up and listening")

while True:
    bytesAddressPair = UDPServerSocket.recvfrom(bufferSize)
    message = bytesAddressPair[0]
    address = bytesAddressPair[1]
    
    clientMsg = "Message from Client: {}".format(message)
    clientIP = "Client IP Address: {}".format(address)
    
    print(clientMsg)
    UDPServerSocket.sendto(bytesToSend, address)

CLIENT 
import socket

msgFromClient = "Hello UDP Server"
bytesToSend = str.encode(msgFromClient)

serverAddressPort = ("127.0.0.1", 20001)
bufferSize = 1024

UDPClientSocket = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
UDPClientSocket.sendto(bytesToSend, serverAddressPort)

msgFromServer = UDPClientSocket.recvfrom(bufferSize)
msg = "Message from Server: {}".format(msgFromServer[0])
print(msg)


Result: Communication between UDP Echo Client and Server has been established 
 successfully.