Add allowed VLAN to Virtual Server - Python F5-SDK

I would advise against using an absolute update on a BIG-IP object as this activates the custom checkbox for every setting - unless this is your intent

Instead of

newvs = vs.virtual.create(name='myvs', destination='10.0.0.1:80')
newvs.mask = '255.255.255.255'
newvs.update()

Use this approach

newvs = vs.virtual.create(name='myvs', destination='10.0.0.1:80')
newvs.update(mask='255.255.255.255')