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Python to RubyAdvent Calendar 2021

Day 1

[py2rb] callable

Last updated at Posted at 2022-01-28

はじめに

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

callable (Python)

if callable(func):

こちらの記事が分かりやすい。独習Pythonには載っていない

defined? (Ruby)

def a; end
b = lambda { |x| p x }
c = 1
class D; end
e = D.new

p defined?(a)
p defined?(b)
p defined?(c)
p defined?(D)
p defined?(e)
p defined?(f)
p '----------'
p [a, b, c, D, e]
p [a.class, b.class, c.class, D.class, e.class]

# output
"method"
"local-variable"
"local-variable"
"constant"
"local-variable"
nil
"----------"
[nil, #<Proc:0x000002a58a4228e0 main.rb:2 (lambda)>, 1, D, #<D:0x000002a58a422840>]
[NilClass, Proc, Integer, Class, D]
Python Ruby
組み込み関数 True method
未定義の関数 False nil
定義済みの関数 True method
定義済みのクラス True constant
lambda - local-variable

行けそうです。

追記

list = [0, 1, 2, 3]
iter_list = iter(list)
print(callable(iter_list))

# false

iter()の場合、falseになります。

list = [0, 1, 2, 3].to_enum

p defined?(list)
p list.class

# "local-variable"
# Enumerator

よって、Enumetatorの場合、クラスを見る必要があります。

メモ

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