'Updates the label and/or the description for an affinity group for the
specified subscription.
affinity_group_name:
The name of the affinity group.
label:
A name for the affinity group. The name can be up to 100 characters
in length.
description:
A description for the affinity group. The description can be up to
1024 characters in length.'

def update_affinity_group(self, affinity_group_name, label, description=None):

    _validate_not_none('affinity_group_name', affinity_group_name)
    _validate_not_none('label', label)
    return self._perform_put(((('/' + self.subscription_id) + '/affinitygroups/') + _str(affinity_group_name)), _XmlSerializer.update_affinity_group_to_xml(label, description))
