human
Solve the following python programming problem given the following code:
@ test.create_stubs ({ 
    api.neutron : ('network_list',), 
    quotas : ('tenant_quota_usages',), 
}) 
def test_network_create_button_disabled_when_quota_exceeded_index(self) : 
    networks_tables.CreateNetwork () 
    def _find_net_button(res) : 
        return self.getAndAssertTableAction (res, 'networks', 'create') 
self._test_create_button_disabled_when_quota_exceeded (<MASK>, network_quota = 0) 
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: self
assistant
#Here is a proper replacement for <MASK>.
def _find_net_button(