human
Solve the following python programming problem given the following code:
def test_update_reserved_dhcp_port(self) : 
    port = { 
        'port' : { 
            'network_id' : 'foo_network_id', 
            'device_owner' : constants.DEVICE_OWNER_DHCP, 
            'fixed_ips' : [{ 
                'subnet_id' : 'foo_subnet_id', 
}], 
}, 
} 
    expected_port = { 
        'port' : { 
            'network_id' : 'foo_network_id', 
            'device_owner' : constants.DEVICE_OWNER_DHCP, 
            portbindings.HOST_ID : 'foo_host', 
            'fixed_ips' : [{ 
                'subnet_id' : 'foo_subnet_id', 
}], 
}, 
        'id' : 'foo_port_id', 
} 
    def _fake_port_action(plugin, context, port, action) : 
        self.assertEqual (expected_port, port) 
self.plugin.get_port.return_value = { 
        'device_id' : utils.get_dhcp_agent_device_id ('foo_network_id', 'foo_host'), 
} 
    self.callbacks._port_action = port 
    self.callbacks.update_dhcp_port (mock.Mock (), host = 'foo_host', port_id = 'foo_port_id', port = port) 
    self.plugin.get_port.return_value = { 
        'device_id' : 'other_id', 
} 
    self.assertRaises (exceptions.DhcpPortInUse, self.callbacks.update_dhcp_port, mock.Mock (), host = 'foo_host', port_id = 'foo_port_id', port = port) 

    
    

    Fix the buggy line: self.callbacks._port_action = port
assistant
#Here is Python program to fix the buggy line: self.

self.callbacks._port_action = def _fake_port_action(