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Python to RubyAdvent Calendar 2021

Day 1

[py2rb] set の差異

Last updated at Posted at 2021-12-08

はじめに

移植やってます

set (Python)

_comments = set('>;')

何気ないsetですが、

>>> print(_comments)
{'>', ';'}

中は既にスプリットされています。

set (Ruby)

require 'set'
_comments = Set.new('>;'.split(''))

二つくらいなら最初から分けておいてもいいんですけど。

intersection (Python)

x = {'is_decoy', 'remove_decoy', 'formula',
                 'ratio', 'correction'}.intersection(kwargs)

intersectionって集合の積なんですけど、このkwargsって辞書型なんですよね。

よくよく見るとSet型でした。
やはり、辞書型でしたが、intersectionを呼んだとき、辞書のキーとの積を取得するようです。

& (Ruby)

x = Set.new(['is_decoy', 'remove_decoy', 'formula',
        'ratio', 'correction']) & kwargs.keys

SetHashの積は取れませんので、Hash#keysを使用します。
この場合、Set.new(Array & Hash.keys)でもSet.new(Array) & Hash.keysでも同じSetが返るようです。

メモ

  • Python の set を学習した
  • 道のりは遠そう
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