Descriptor '__Init__' of 'Super' Object Needs Argument
I'm Trying My Hand at Making an Object-Oriented Text-Based Game in Python, and Attempting to Implement My First Properties and Decorators. Using the Chapter 5...
I'm trying my hand at making an Object-Oriented text-based game in Python, and attempting to implement my first properties and decorators. Using the chapter 5 in the book 'Python 3 Object Oriented Programming', I've tried to use the examples and concepts discussed to get the following code to set a Game-object's 'current_room' property upon instantiation:
class Room(object):
''' An area of the game's map.'''
def __init__(self):
print("Accessing the Room __init__ method.")
class FirstRoom(Room):
''' Just some room.'''
def __init__(self):
print("Accessing the FirstRoom __init__ method.")
super.__init__()
class SecondRoom(Room):
''' Just some other room.'''
def __init__(self):
print("Accessing the SecondRoom __init__ method.")
super.__init__()
class Game(object):
''' Creates a new game.'''
current_room = None # Class-level definition of this property.
def __init__(self):
print("Created a new Game object.")
self.current_room = FirstRoom()
@property
def current_room(self):
''' Returns the current position of the actor.'''
print("Getting the _current_room attribute for the Game object.")
return self._current_room
@current_room.setter
def set_room(self, new_room):
''' Sets the current_room property of the Game object.'''
print("Setting the _current_room attribute for the Game object.")
self._current_room = new_room
However, when I run this code, I get the following output:
>>> g = Game()
Created a new Game object.
Accessing the FirstRoom __init__ method.
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/drew/Desktop/test.py", line 27, in __init__
self.current_room = FirstRoom()
File "/home/drew/Desktop/test.py", line 11, in __init__
super.__init__()
TypeError: descriptor '__init__' of 'super' object needs an argument
What am I missing from my code to make this syntax work? Do I need to explicitly define a Descriptor for my 'current_room' property? [The book doesn't mention anything about Descriptors, at least not like what you would find here: Python Descriptors Demystified.]
3 Answers
use super().__init__() instead of super.__init__()
Here the working code:
class Room(object):
''' An area of the game's map.'''
def __init__(self):
print("Accessing the Room __init__ method.")
class FirstRoom(Room):
''' Just some room.'''
def __init__(self):
print("Accessing the FirstRoom __init__ method.")
#super.__init__()
super(FirstRoom, self).__init__()
class SecondRoom(Room):
''' Just some other room.'''
def __init__(self):
print("Accessing the SecondRoom __init__ method.")
super(SecondRoom, self).__init__()
#super.__init__()
class Game(object):
''' Creates a new game.'''
_current_room = None # Class-level definition of this property.
def __init__(self):
print("Created a new Game object.")
self._current_room = FirstRoom()
@property
def current_room(self):
''' Returns the current position of the actor.'''
print("Getting the _current_room attribute for the Game object.")
return self._current_room
@current_room.setter
def set_room(self, new_room):
''' Sets the current_room property of the Game object.'''
print("Setting the _current_room attribute for the Game object.")
self._current_room = new_room
and when run:
>>> g = Game()
Created a new Game object.
Accessing the FirstRoom __init__ method.
Accessing the Room __init__ method.
>>>
Hope this may help you.
The super error is actually from putting the print before your call to super the following code works:
class Room(object):
''' An area of the game's map.'''
def __init__(self):
print("Accessing the Room __init__ method.")
class FirstRoom(Room):
''' Just some room.'''
def __init__(self):
super().__init__()
print("Accessing the FirstRoom __init__ method.")
class SecondRoom(Room):
''' Just some other room.'''
def __init__(self):
super().__init__()
print("Accessing the SecondRoom __init__ method.")
Your need to learn how @property etc.. works.
From the docs, Be sure to give the additional functions the same name as the original property
class Game(object):
''' Creates a new game.'''
current_room = None # Class-level definition of this property.
def __init__(self):
print("Created a new Game object.")
self._current_room = FirstRoom()
@property
def current_room(self, room):
''' Returns the current position of the actor.'''
print("Getting the _current_room attribute for the Game object.")
return self._current_room
@current_room.setter # same function name as the property.
def current_room(self, new_room):# same name as the property
''' Sets the current_room property of the Game object.'''
print("Setting the _current_room attribute for the Game object.")
self._current_room=new_room
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