Python text game not calling the correct number

I am writing a text game and I want to link each room to four other rooms - north, south, east and west. Now I start from the north. The user should be able to enter "walk north" and the north room should be called up.

I used three files - one where I will write the main story, one to bring up the corresponding room in the story, and the other to navigate to avoid cross-imports.

rooms.py:

import actions

class FirstRoom(object):

    room_name = 'FIRST ROOM'
    north = 'north_room'

    def __init__(self):
        pass

    def start(self):
        print self.room_name
        while True:
            next = raw_input('> ')
            actions.walk(next, self.north)
            actions.command(next)


class North(object):

    room_name = "NORTH ROOM"

    def __init__(self):
        pass

    def start(self):
        print self.room_name

      

        
        
        
      

    

actions.py:

import navigation

def walk(next, go_north):
    """Tests for 'walk' command and calls the appropriate room"""
    if next == 'walk north':
        navigation.rooms(go_north)
    else:
        pass

      

        
        
        
      

    

navigation.py:

import rooms
first_room = rooms.FirstRoom()
north_room = rooms.North()

def rooms(room):
    rooms = {
        'first_room': first_room.start(),
        'north_room': north_room.start(),
        }
    rooms[room]

      

        
        
        
      

    

When I run first_room.start () it should print "FIRST ROOM" which it does. Then I type "walk north" and I expect it to print "NORTH ROOM" but instead print "FIRST ROOM" again.

I can't figure out all my life why this doesn't work the way I expect it to be, as if it were calling first_room again instead of north_room. Can anyone understand what I am doing wrong?