
import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.bind(('127.0.0.1', 9999))

print('Binding UDP on 9999...')

while True:
    data, addr = s.recvfrom(1024)
    print('Received from $s:$s.' % addr)
    s.sendto(b'Hello, %s!' % data, addr)



import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.bind(('127.0.0.1', 9999))

print('Binding UDP on 9999...')

while True:
    data, addr = s.recvfrom(1024)
    print('Received from %s:%s.' % addr)
    s.sendto(b'Hello ' + data, addr)


correct udp