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Python to RubyAdvent Calendar 2021

Day 2

[py2rb] double splat引数 と 実行速度の検証

Last updated at Posted at 2022-01-05

はじめに

移植やってます。
( from python 3.7 to ruby 2.7 )

double splat引数 (Python)

def charge(sequence, pH, **kwargs):
# 略

class ElectrochemTest(unittest.TestCase):
    def test_charge_calculations_str(self):
        self.assertTrue(
            abs(charge('AAA', 5.0,
                       pK={'H-': [(9., 1)], '-OH': [(8., -1)]},
                       pK_nterm={'H-': {'A': [(3., 1)]}})) < 0.01)

pKpK_ntermって仮引数にないのですが、実は辞書のキーでした。

double splat引数 (Ruby)

def charge(sequence, pH, **kwargs)
# 略
end

class TestEctrochem < Minitest::Test
  def test_charge_calculations_str
    assert charge(
      'AAA', 5.0,
        'pK' => {'H-' => [[9.0, 1]], '-OH' => [[8.0, -1]]},
        'pK_nterm' => {'H-' => {'A' => [[3.0, 1]]}}
    ).abs < 0.01
  end
end
def charge(sequence, pH, **kwargs)
# 略
end

class TestEctrochem < Minitest::Test
  def test_charge_calculations_str
    assert charge(
      'AAA', 5.0,
+      {
        'pK' => {'H-' => [[9.0, 1]], '-OH' => [[8.0, -1]]},
        'pK_nterm' => {'H-' => {'A' => [[3.0, 1]]}}
+      }
    ).abs < 0.01
  end
end
def charge(sequence, pH, **kwargs)
# 略
end

class TestEctrochem < Minitest::Test
  def test_charge_calculations_str
    assert charge(
      'AAA', 5.0,
+      **{
        'pK' => {'H-' => [[9.0, 1]], '-OH' => [[8.0, -1]]},
        'pK_nterm' => {'H-' => {'A' => [[3.0, 1]]}}
+      }
    ).abs < 0.01
  end
end

{}なし{}あり**{}の3つを書きましたが、この内{}ありはエラーが発生するので、コントリビュートチャンスだそうです。

ArgumentError: wrong number of arguments (given 3, expected 2)

速度の検証

こちらの記事によりますと、double splatは遅いらしいです。

minitestの結果を参照しますと、レシーバ側はkwargs = {}、呼び出し側は{}なしが速そうです。Ruby 3 何?それっておいしいの?

**kwargs kwargs = {}
{}なし 2736.8176 assertions/s 3226.1533 assertions/s
**{} 3005.5192 assertions/s 3190.0239 assertions/s

メモ

  • Python の double splat引数 を学習した
  • 百里を行く者は九十里を半ばとす
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