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@Feel-Physics

代入式で左辺にスライスを入れるのはなぜか

More than 5 years have passed since last update.

以下の2行の違い(左辺にスライスを入れるのはなぜか)がわかりにくかったので備忘録。

y[:] = x
y = x

以下のように、y[:] = xではyのidは変わらないが、y = xではyのidはxのそれになる。

>>> x = [1,2,3]
>>> y = [4,5,6]
>>> id(x)
4481009352
>>> id(y)
4481133744
>>> y[:] = x
>>> y
[1, 2, 3]
>>> id(y)
4481133744
>>> y = x
>>> y
[1, 2, 3]
>>> id(y)
4481009352

ブログやってます:Weed software

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Feel-Physics
今はHoloLensのアプリを開発しており、技術記事はすべてブログ( http://weed.nagoya )に書いています。以前はSwift、OpenCV+Python、JavaScript、Objective-Cを書いていました。

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Help us understand the problem. What is going on with this article?