sms.class = 0 invalid syntax

[jbdu94]

Hi

I tried the example, but it doesn't work, it says "invalid syntax"
Of course on my pc I used my phone number

from messaging.sms import SmsSubmit

sms = SmsSubmit("+44123231231", "hey how's it going?")
sms.class = 0
pdu = sms.to_pdu()[0]

print pdu.length, pdu.pdu

result:
File "send_sms.py", line 6
sms.class = 0
^
SyntaxError: invalid syntax