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Python to RubyAdvent Calendar 2021

Day 6

[py2rb] 自作ライブラリの関数の呼び出し

Last updated at Posted at 2022-02-03

はじめに

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

関数 (Python)

bb.py
def make_qv(x):
    return x + 1

qv = make_qv(1)
main.py
import bb

print(bb.make_qv(2))
print(bb.qv)
output
3
2

def make_qvmainbbの双方から呼び出し可能です。

どうすRuby

bb.rb
module BB
  def make_qv(x)
    return x + 1
  end

  qv = make_qv(1)
end
main.rb
require_relative 'BB'

puts BB.make_qv(2)
puts BB.qv
output
undefined method `make_qv' for BB:Module

おお、qv = make_qv(1)でメソッドが見つからないと仰せですか。
ここは、モジュールの特異メソッドで。

bb.rb
module BB
  def self.make_qv(x)
    return x + 1
  end

  qv = make_qv(1)
end
output
3
undefined method `qv' for BB:Module

ああ、ゲッターが無いのか。

bb.rb
module BB
  def self.make_qv(x)
    return x + 1
  end

  def self.qv
    @qv ||= make_qv(1)
  end
end
output
3
2

よしよし。

今回の例では、module_function :make_qv, :qvでもいけますが、module BB内で@qvを利用する場合は特異メソッドでないと、動作しないようです。

メモ

  • Python の 関数の呼び出し を学習した
  • 百里を行く者は九十里を半ばとす
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