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class内のdelattr(self,'xxxx')では自身のプロパティを消してくれない罠

Posted at

今回は軽い発見があったので、備忘録として書き込みます。

以下のコードを見ていて気づかなかったのだが、
このdelattrでは、プロパティは消えてくれない。

class Hoge(object):
    
    huga = 'hugahuga'

    def del_propaty(self):
        delattr(self, 'huga')

>>> hoge = Hoge()
>>> print(getattr(hoge,'huga'))
hugahuga
>>> hoge.del_propaty()

Traceback (most recent call last):
  File "/usr/lib/python3.9/code.py", line 90, in runcode
    exec(code, self.locals)
  File "<input>", line 1, in <module>
  File "<input>", line 5, in del_propaty
AttributeError: huga

>>> print(getattr(hoge,'huga'))
hugahuga

このstockoverflowで確認すると、以下のようにself.__class__としないといけないようです。
↓以下修正したコード

class Hoge(object):
    
    huga = 'hugahuga'

    def del_propaty(self):
        delattr(self.__class__, 'huga')
>>> hoge = Hoge()
>>> print(getattr(hoge,'huga'))
hugahuga
>>> hoge.del_propaty()
# エラー出ず、getattrでも取れなくなっていました。
>>> print(getattr(hoge,'huga'))
Traceback (most recent call last):
  File "/usr/lib/python3.9/code.py", line 90, in runcode
    exec(code, self.locals)
  File "<input>", line 1, in <module>
AttributeError: 'Hoge' object has no attribute 'huga'

以上です。
小さい発見ですが、またちょっとpythonを知れたそんな気分でした。

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