如何正确地调用类

Question

我是一个Python（和一般编程）新手，我正在尝试使用基于列表的随机房间/遇到一个基于文本的无尽RPG。这个代码（当然）还没有完成，它只是用于测试。请注意，我进口的敌人从另一个.py文件：

import Enemies 
import random  


class Room: 
# template definition to define all rooms 
    def __init__(self, intro): 
     self.intro = intro 


class VsRoom(Room): 
# room with an enemy 
    def __init__(self, enemy): 
     self.enemy = random.choice(Enemy_List) 
     super().__init__(intro = "There's an enemy here!") 


class NullRoom(Room): 
# empty, boring room 
    def __init__(self): 
     super().__init__(intro = "Nothing Interesting here.") 


Rooms = [VsRoom, NullRoom] # All future room "types" will go here 


def print_room(): 
# Tells the player which kind of room they are 
    print("You enter the next room...") 
    Gen_Room = random.choice(Rooms) 
    print(Gen_Room.intro) 

我想打印室（）打印“你在旁边的房间进入...”，随机从列表中挑选一个房间，并打印其介绍，但是当我尝试运行它，我得到这个：

You enter the next room... 
[...] 
print(Gen_Room.intro) 
AttributeError: type object 'NullRoom' has no attribute 'intro' 

Process finished with exit code 1 

我想学习班的工作和任何帮助会为我是巨大的。我试图尽可能多地遵循PEP8，我也试图找到类似的问题，但没有成功。

Answer 1

从我观察你，你选择的敌人的名单，这样你就不会需要输入参数：

class VsRoom(Room): 
# room with an enemy 
    def __init__(self): 
     self.enemy = random.choice(Enemy_List) 
     super().__init__(intro = "There's an enemy here!") 

要创建一个实例，你必须做到如下：

{class name}() 

所以，你必须改变：

Gen_Room = random.choice(Rooms) 

要：

Gen_Room = random.choice(Rooms)() 

完整代码：

import Enemies 
import random  

class Room: 
# template definition to define all rooms 
    def __init__(self, intro): 
     self.intro = intro 


class VsRoom(Room): 
# room with an enemy 
    def __init__(self): 
     self.enemy = random.choice(Enemy_List) 
     super().__init__(intro = "There's an enemy here!") 


class NullRoom(Room): 
# empty, boring room 
    def __init__(self): 
     super().__init__(intro = "Nothing Interesting here.") 


Rooms = [VsRoom, NullRoom] # All future room "types" will go here 


def print_room(): 
# Tells the player which kind of room they are 
    print("You enter the next room...") 
    Gen_Room = random.choice(Rooms)() 
    print(Gen_Room.intro)