September 2014
Intermediate to advanced
332 pages
6h 48m
Japanese
Content preview from Python文法詳解
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225
6.4 クラス
6.4.5
クラスブロックとスコープ
class
文のブロックは、モジュールを実行してクラスオブジェクトを作成するとき、関数などと
同じように
class
文のブロックをスコープとする名前空間で実行されます。クラスブロックの記述
内容は、通常のモジュールや関数とほぼ同じように処理を記述できます。
class Spam:
HAM = 1
EGG = HAM
def sausage():
return 'Spam.sausage'
if CHEESE:
def bacon():
pass
この
class
文を実行すると、ブロックの名前空間には
HAM
、
EGG
、
sausage
などのオブジェクト
が登録されます。この名前空間の辞書は、そのままクラスオブジェクト
Spam
の名前空間として使
われ、ブロックで作成された要素はクラスオブジェクトのメンバーとして参照できるようになりま
す。
>>> Spam.HAM # Spam
クラスの属性
HAM
を参照
1
>>> Spam.sausage() # Spam
クラスの属性
sausage
を呼び出し
'Spam.sausage!'
クラスの名前空間辞書は、
__dict__
という名前の、マッピング型の属性として参照できます。
>> Spam.__dict__
mappingproxy({'HAM': 1, 'EGG': 1, 'sausage': <function Spam.sausage at 0x101631b00>, ...
クラススコープでは、ほとんどモジュールや関数と同じように処理を行えますが ...
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