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python でファイルを read してリストにする時に、改行コードを入れない

Posted at

こんなファイルがあるとして

$ cat /tmp/foo.txt 
foo
bar

pon

readlines()を使うとこうなっちゃう

with open('/tmp/foo.txt', 'r') as f:
    lines = f.readlines()
    
    # print lines -> ['foo\n', 'bar\n', '\n', 'pon\n']

けど大抵の場合\nは付いてこなくて良いので、今まで何年もずっとこうやってた

with open('/tmp/foo.txt', 'r') as f:
    lines = map(lambda s: s.strip(), f.readlines())

    # print lines -> ['foo', 'bar', '', 'pon']

どうも素直に左から読めないし、map(strip, f.readlines())って書けないしですっきりしないので悶々としてた

けど、こう書けることをたまたま知って、とても感動したのでメモ

with open('/tmp/foo.txt', 'r') as f:
    lines = f.read().splitlines()

    # print lines -> ['foo', 'bar', '', 'pon']

これはすっきりしてて良いなぁ!
そんだけ!

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