class Room(object):
    
    def __init__(self, name, description):
        self.name = name
        self.description = description
        self.paths = {}
        
    def go(self, direction):
        return self.paths.get(direction, None)
        
    def add_paths(self, paths):
        self.paths.update(paths)
 

from nose.tools import *
from ex47.game import Room

def test_room():
    gold = Room("GoldRoom",
                """This room has gold in it you can grab. There's a 
                door to the north.""")
    assert_equal(gold.name, "GoldRoom")
    assert_equal(gold.paths, {})
    
def test_room_paths():
    center = Room("Center", "Test room in the center.")
    north = Room("North", "Test room in the north.")
    south = Room("South", "Test room in the south.")

    center.add_paths({'north': north, 'south': south})
    assert_equal(center.go('north'),north)
    
    assert_equal(center.go('south'),south)
    
def test_map():
    start = Room("Start", "You can go west and down a hole.")
    west = Room("Trees", "There are trees here, you can go east.")
    down = Room("Dungeon", "It's dark down here, you can go up.")
    
    start.add_paths({'west': west, 'down': down})
    west.add_paths({'east': start})
    down.add_paths({'up': start})
    
    assert_equal(start.go('west'), west)
    assert_equal(start.go('west').go('east'), start)
    assert_equal(start.go('down').go('up'),start)
    
 

import 自定義的模組時，首先要設定環境變數

OSX/Linux:

export PYTHONPATH=.

比如：

export PYTHONPATH==$PYTHONPATH:/Users/ghx/Desktop/10_MyCode/Python/Learn_Python_the_hard_way/ex47

可以通過如下命令查詢是否設定成功：

>>> import sys
>>> sys.path
['', '/Users/ghx/Desktop/10_MyCode/Python/Learn_Python_the_hard_way/ex47', '/usr/local/lib/wxPython-3.0.2.0/lib/python2.7/site-packages', '/usr/local/lib/wxPython-3.0.2.0/lib/python2.7/site-packages/wx-3.0-osx_cocoa', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages', '/usr/local/lib/wxPython-3.0.2.0/lib/python2.7', '/Library/Python/2.7/site-packages']
>>> exit()
 

And on Windows:

$env:PYTHONPATH = "$env:PYTHONPATH;."