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None オブジェクト — Python 3.6.5 ドキュメント
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None
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オブジェクト
<
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class
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href
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¶
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None
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PyTypeObject
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</
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a
>
は、 Python/C API では直接公開されていないので注意してください。
<
code
class
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"
>
<
span
class
="
pre
"
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None
</
span
>
</
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は単量子 (singleton) なので、オブジェクトの同一性テスト (C では
<
code
class
="
docutils literal
"
>
<
span
class
="
pre
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>
==
</
span
>
</
code
>
) を使うだけで十分だからです。同じ理由から、
<
code
class
="
xref c c-func docutils literal
"
>
<
span
class
="
pre
"
>
PyNone_Check()
</
span
>
</
code
>
関数はありません。
</
p
>
<
dl
class
="
var
"
>
<
dt
id
="
c.Py_None
"
>
<
a
class
="
reference internal
"
href
="
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"
title
="
PyObject
"
>
PyObject
</
a
>
*
<
code
class
="
descname
"
>
Py_None
</
code
>
<
a
class
="
headerlink
"
href
="
#c.Py_None
"
title
="
この定義へのパーマリンク
"
>
¶
</
a
>
</
dt
>
<
dd
>
<
p
>
Python における
<
code
class
="
docutils literal
"
>
<
span
class
="
pre
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>
None
</
span
>
</
code
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オブジェクトで、値がないことを表します。このオブジェクトにはメソッドがありません。参照カウントについては、このオブジェクトも他のオブジェクトと同様に扱う必要があります。
</
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>
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<
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Py_RETURN_NONE
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href
="
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title
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この定義へのパーマリンク
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>
¶
</
a
>
</
dt
>
<
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>
<
p
>
C 関数からの
<
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Py_None
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<
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"
>
<
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Py_None
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</
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</
a
>
の返却を適切に扱います。
(これは
<
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>
<
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class
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>
None
</
span
>
</
code
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の参照カウントをインクリメントして返します。)
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