July 2018
Intermediate to advanced
596 pages
13h 35m
Japanese
Content preview from Pythonによるデータ分析入門 第2版 ―NumPy、pandasを使ったデータ処理
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2.3
Python
の基礎
53
if-else
ブロックと同様に、三項演算子で実行されるのは
true-expr
もしくは
false-expr
のどちらか
片方です。三項演算子は
if
と
else
の双方に式を書き、これが
1
行で表されているため、この両方が評
価されるのであれば無駄な計算が発生するように見えるかもしれません。ですが実際に評価されるの
は条件に合致する一方の式だけです。
コード量短縮のために、あらゆる条件文を三項演算子で書いてしまおうと考えるかもしれません。し
かし条件式や真偽式が複雑なときほど、三項演算子は可読性を犠牲にすることがあることを心に留め
てもらえたらと思います。
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.