I've just installed the python3 release of houdini for testing.
Is it the case that the sidefxlabs package isn't ported yet?

Here's the error when I attempt to run the shelf from the menu :

Traceback (most recent call last):
File “<stdin>”, line 3, in <module>
File “C:/PROGRA~1/SIDEEF~1/HOUDIN~1.510/houdini/python3.7libs\sidefxlabs.py”, line 8, in <module>
import urllib2
ModuleNotFoundError: No module named ‘urllib2’

Any suggestions?
Thanks!
p.