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Python to RubyAdvent Calendar 2021

Day 17

[py2rb] 多重継承の5

Last updated at Posted at 2022-02-24

はじめに

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

多重継承 (Python)

前回の記事の コメント にて、@Nabetani さんよりメソッドのまとめ方を教えていただきましたので、それを踏まえて再びやってみました。

20220224a.png

  • 一番目の行は、ファイル名(Rubyですとmodule名)
  • C:class, SC:継承するsuperclass
  • D:メソッド定義, DS:メソッド内でsuperを使用しているメソッド定義

継承テスト(Python)

class C5:
    s1 = None
    s3 = None
    s5 = 's5'
    def __init__(self):
        print('C5')

class C4(C5):
    s4 = 's4'
    def __init__(self):
        print('C4')
        
class C2(C4):
    s2 = 's2'
    def __init__(self):
        print('C2')
        super().__init__()

class C3:
    s3 = 's3'
    def __init__(self):
        print('C3')

class C1(C2, C3):
    s1 = 's1'
    def __init__(self):
        print('C1')
        super().__init__()
        print(self.s1)
        print(self.s2)
        print(self.s3)
        print(self.s4)
        print(self.s5)

C1()

# output
C1
C2  
C4  
s1  
s2  
None
s4  
s5 

ふむふむ。
クラス変数も受け継がれてますね。

継承テスト(Ruby)

module C5
  @@s1 = 'None'
  @@s3 = 'None'
  @@s5 = 's5'
  def __init__
    puts 'C5'
  end
end

module C4
  include C5
  @@s4 = 's4'
  def __init__
    puts 'C4'
  end
end
      
module C2
  include C4
  @@s2 = 's2'
  def __init__
    puts 'C2'
    super
  end
end

module C3
  @@s3 = 's3'
  def __init__
    puts 'C3'
  end
end

class C1
  include C2, C3
  @@s1 = 's1'

  def initialize
    __init__
  end

  def __init__
    puts 'C1'
    super
    puts @@s1
    puts @@s2
    puts @@s3
    puts @@s4
    puts @@s5
  end
end

c = C1.new
p C1.ancestors

# output
C1
C2
C4
s1
s2
s3
s4
s5
[C1, C2, C4, C5, C3, Object, Kernel, BasicObject]

s3が惜しかったですが、継承チェーンは正しいようです。

メモ

  • Python の 多重継承の5 を学習した
  • 百里を行く者は九十里を半ばとす
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