Python 2.7 Python 2.7，打印文档字符串（文档注释）时出现问题”；函数没有属性“u doc”；错误

我正在研究LPTHW ex 41，其中我们修改了一组打印语句，使用docstring样式，然后使用runner打印它们

代码最初是这样的：

Function()
Print "Several lines of printed material"

修订后，功能开始：

Function()
"""doc comment"""

运行程序将所有函数（“文件室”）连接起来，目的是打印文档注释，而不是打印命令

ROOMS = {
'death': death,
'central_corridor': central_corridor,
'laser_weapon_armory': laser_weapon_armory,
'the_bridge': the_bridge,
'escape_pod': escape_pod
}


def runner(map, start):

    next = start

    while True:
        room = map[next]
        print "\n----------------"
        print room._doc_
        next = room()

runner(ROOMS, 'central_corridor')

但我一直在犯错误

'function" object has no attribute '_doc_'

示例室：

def central_corridor():
"""You wanna blow thing up.
You running toward place for to get bomb.
Emeny approach!

1 = shoot at enemy
2 = avoid emenemeny
3 = use bad pick up line on emenie
4 = hint"""

#print(_doc_)

action = int(raw_input("> "))

if action == 1:
    print "He shoot you first."
    return 'death'

elif action == 2:
    print "No he still gots you."
    return 'death'

elif action == 3:
    print "Oh yeah sexy boy."
    print "You get past laughing enemy."
    return 'laser_weapon_armory'

elif action == 4:
    print "Emeny like good joke."
    return 'central_corridor'

else:
    print "You enter wrong input"
    return 'central_corridor'

---

有人能告诉我如何打印文档注释吗？谢谢

注意到文档需要两个下划线。固定的

_doc_

__doc__

---

注意，doc需要两个下划线。固定的

_doc_

__doc__