我正在尝试使用Python2.7.10编写一个继承自OrderedDict的python类。
最基本的类如下所示:
from collections import OrderedDict
class Game (OrderedDict):
def __init__(self,theTitle="",theScore=0):
self['title'] = theTitle
self['score'] = theScore
def __str__(self):
return "hi"
#return 'title: ' + self['title'] + ", score:" + str(self['score'])当我运行它时,我得到这个错误:
(metacrit) Jasons-MBP:mc jtan$ python
Python 2.7.10 (default, Oct 6 2017, 22:29:07)
[GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.31)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from game import Game
>>> g = Game('battlezone',100)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "game.py", line 7, in __init__
self['title'] = theTitle
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/collections.py", line 64, in __setitem__
root = self.__root
AttributeError: 'Game' object has no attribute '_OrderedDict__root'
>>>有人能告诉我我哪里做错了吗?我非常确定OrderedDict在这个版本的Python中,这是我认为的第一件事,但我还不确定要去哪里。到目前为止,我还不是python原生用户。
发布于 2018-08-21 18:16:30
您忘记了初始化基类。在您的代码中,__init__仅初始化Game元素,而无法初始化底层OrderedDict。必须显式调用基类__init__方法:
class Game (OrderedDict):
def __init__(self,theTitle="",theScore=0):
OrderedDict.__init__(self)
self['title'] = theTitle
self['score'] = theScore
def __str__(self):
return "hi"
#return 'title: ' + self['title'] + ", score:" + str(self['score'])然后,您可以成功地执行以下操作:
>>> g = Game('battlezone',100)
>>> g
Game([('title', 'battlezone'), ('score', 100)])
>>> str(g)
'hi'由于__repr__尚未被覆盖,因此您可以看到OrderedDict表示。
https://stackoverflow.com/questions/51946149
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