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はじめに

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

partition, rpartition (Python)

s = 'a,b,c'

print(s.partition(','))
print(s.rpartition(','))
print(s.partition('/'))
print(s.rpartition('/'))
print(s.partition(''))
print(s.rpartition(''))

('a', ',', 'b,c')
('a,b', ',', 'c')
('a,b,c', '', '')
('', '', 'a,b,c')
ValueError: empty separator

文字列を区切りますが、空文字の場合エラーとなります。

partition, rpartition (Ruby)

s = 'a,b,c'

p s.partition(',')
p s.rpartition(',')
p s.partition('/')
p s.rpartition('/')
p s.partition('')
p s.rpartition('')

["a", ",", "b,c"]
["a,b", ",", "c"]
["a,b,c", "", ""]
["", "", "a,b,c"]
["", "", "a,b,c"]
["a,b,c", "", ""]

ruby でも同様のメソッドがありますが、空文字の場合の動作が異なります。

メモ

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