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[python] インスタンス変数の一覧を取得する

Last updated at Posted at 2020-03-21

まず

次のようなオブジェクトがあるとします。

class Tarou:
    def __init__(self):
        self.name = 'tarou'
        self.age = 15
        
tarou = Tarou()
tarou.height = 170
tarou.weight = 58

一覧取得

その① vars

@shiracamus さんにコメントいただきました。dict形式で返してくれる関数があります。

print(vars(tarou))
実行結果
{'name': 'tarou', 'age': 15, 'height': 170, 'weight': 58}
こんな感じで使うといんじゃないでしょうか
class Tarou:
    def __init__(self):
        self.name = 'tarou'
        self.age = 15

    def get_my_instance_var_names(self):
        return vars(self)

tarou = Tarou()
print(tarou.get_my_instance_var_names())
{'name': 'tarou', 'age': 15}

その② インスタンス.__dict__

print(tarou.__dict__)
実行結果
{'name': 'tarou', 'age': 15, 'height': 170, 'weight': 58}

注意点

dict属性のもでなければエラーとなります。

TypeError: vars() argument must have __dict__ attribute

参考

エキスパートPythonプログラミング

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