refactor(udp_server): Convert script from Python 2 to 3 (#9513)

libraries/WiFi/examples/WiFiUDPClient/udp_server.py

@@ -6,17 +6,17 @@
 try :
     s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-except socket.error, msg :
-    print 'Failed to create socket. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
+except socket.error as msg :
+    print('Failed to create socket. Error Code : ' + str(msg[0]) + ' Message ' + msg[1])
     sys.exit()
 
 try:
     s.bind(('', 3333))
-except socket.error , msg:
-    print 'Bind failed. Error: ' + str(msg[0]) + ': ' + msg[1]
+except socket.error as msg:
+    print('Bind failed. Error: ' + str(msg[0]) + ': ' + msg[1])
     sys.exit()
 
-print 'Server listening'
+print('Server listening')
 
 while 1:
     d = s.recvfrom(1024)
@@ -25,6 +25,6 @@
     if not data: 
         break
 
-    print data.strip()
+    print(data.strip())
 
 s.close()