Python中的Elif语法错误

Question

这是我在用Python制作的一个文字冒险游戏中的if/elif/else条件代码。这个部分的目的是给玩家提供选择，让他们决定接下来要做什么，但系统提示我所有的"elif"语句的语法有问题。

if command.lower() in ["north", "n"]:
    #With invitation
    if "invitation" in items:
        castle()
    #Without 'Invitation'   
    else:
        print "As you walk towards the gate, a guard approaches you and pushes you away. \"Sorry, pal,\" says the guard,\"You can't get in the castle without a written invitation from the king\""
        town_center()


elif command.lower() in ["east", "e"]:

    #market()

elif command.lower() in ["south", "s"]:

    #forest()

elif command.lower() in ["west", "w"]:

    #village()

elif command.lower() in ["inventory", "i"]:

    print items
    town_center()

elif command.lower() in ["look", "l"]:

    print "\nYou are standing in the center of the rural town of Grifiinhorn, a quaint rural town in the province of Bedrin. To the north, you see a giant castle sitting on top of a hill. To the east is the marketplace, and to the west is the village. To the south is exit gates of the town which faces the Dark Forest.\n" 
    town_center()

else:
    town_center()

我总是收到这个错误信息：

elif command.lower() in ["east", "e"]:
   ^
SyntaxError: invalid syntax

Answer 1

编辑：虽然这也是一个错误，但这并不是导致他出现语法错误的原因。

在代码块里必须有一些东西。因为你注释掉了一些行：

elif command.lower() in ["south", "s"]:

    #forest()

elif command.lower() in ["west", "w"]:

在第一个elif:之后的代码块里没有任何代码，所以当下一个elif:被找到时，就会出现语法错误。

在你注释掉的代码块里加一个pass语句：

elif command.lower() in ["south", "s"]:
    #forest()
    pass
elif command.lower() in ["west", "w"]:

pass什么都不做，但在这种情况下，它可以形成一个代码块。