Dear Adi

Try this

    @api.model
    def fields_view_get(self, view_id=None, view_type='form', toolbar=False, submenu=False):
        res=super(PickingClass, self).fields_view_get(view_id=view_id, view_type=view_type, toolbar=toolbar, submenu=submenu)
        if view_type != 'search' and not(self.env.user.has_group('YourModule.YourGroup')):
                root = etree.fromstring(res['arch'])
                root.set('create', 'false')
                res['arch'] = etree.tostring(root)
        return res

I hope I helped You...

Hello, 

you can achieve this either by fields_view_get or using the security rights.

for the security group, make one security group and assign that group on the button. then whom you assign that group, only that user can see the button.