import socket
UDP_IP_TR = "10.0.0.7"
UDP_PORT_TR = 4660
MESSAGE = "Hello, World!"
 
print ("UDP target IP:", UDP_IP_TR)
print ("UDP target port:", UDP_PORT_TR)
print ("message:", MESSAGE)
 
sock = socket.socket(socket.AF_INET, # Internet
                     socket.SOCK_DGRAM) # UDP
sock.sendto(MESSAGE, (UDP_IP_TR, UDP_PORT_TR))

 UDP target IP: 10.0.0.7
UDP target port: 4660
message: Hello, World!
Traceback (most recent call last):
  File "C:\Users\Anatoliy\AppData\Local\Programs\Python\Python35-32\MyProg\proba_tr.py", line 12, in <module>
    sock.sendto(MESSAGE, (UDP_IP_TR, UDP_PORT_TR))
TypeError: a bytes-like object is required, not 'str'

  
MESSAGE = b"Hello, World!"

 a = (127,215,11,83,117)

 >>> import struct
>>> a = (127,215,11,83,117)
>>> s = struct.pack('{}B'.format(len(a)), *a)
>>> print(s)
b'\x7f\xd7\x0bSu'

  
>>> t = (127, 215, 11, 83, 117)
>>> b = bytes(t)
>>> b
b'\x7f\xd7\x0bSu'
>>>