Python的if語句

Question

在我的Python程序有時會在我的if語句只有最上面的一個工作

這裏是我的程序 http://ubuntuone.com/0u2NxROueIm9oLW9uQVXra

當你，如果你去北東向西向南，然後它不運行程序「科技工作 的問題是在功能房間4（）：

def room4(): 
    """Forest go south to small town room 1 and east to forest path room8""" 
    room = 4 
    print "Forest you can go south to small town, east to forest path, or continue to explore the forest" 
    cmd = raw_input('> ') 
    cmd = cmd.lower() 
    if cmd == "e" or cmd == "east" or "go east": 
     print room8() 
    if cmd == "s" or cmd == "south" or "go south": 
     print room1() 
    if cmd == "forest" or cmd == "explore" or cmd == "explore forest" or cmd == "explore the forest": 
     print room13() 
    else: 
     print error() 
     print room4() 

Answer 1

在未來，請提供您的問題相關的代碼。我想你指的是以下幾點：

if cmd == "e" or cmd == "east" or "go east": 
    print room8() 
if cmd == "s" or cmd == "south" or "go south": 
    print room1() 
if cmd == "forest" or cmd == "explore" or cmd == "explore forest" or cmd == "explore the forest": 
    print room13() 
else: 
    print error() 
    print room4() 

，你將永遠進入第一if聲明的原因是，你有or "go east"，而不是or cmd == "go east"。布爾上下文中的字符串（如if語句）評估爲true。

相反的if cmd == "e" or cmd == "east" or cmd == "go east"，你可以使用以下命令：

if cmd in {"e", "east", "go east"}: 
    ... 

如果你是在Python 2.6或以下，其中不存在集文字，而不是{"e", "east", "go east"}使用set(("e", "east", "go east"))。