def unbind_tags(self): 
    # Set the instance_id you want to operate 
    instance_id = 'your-choose-instance-id' 
    # Set the tag you want to unbind 
    change_tags = [{"tagKey" : "test_key", "tagValye" : "test_val"}] 
    self.client.unbind_tags(instance_id = instance_id, change_tags = change_tags)