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【Udemy Python3入門+応用】 58. ラムダ

Posted at

※この記事はUdemyの
現役シリコンバレーエンジニアが教えるPython3入門+応用+アメリカのシリコンバレー流コードスタイル
の講座を受講した上での、自分用の授業ノートです。
講師の酒井潤さんから許可をいただいた上で公開しています。

##■functionを引数に使うとき
####◆普通に記述する

l = ['Mon', 'tue', 'Wed', 'Thu', 'fri', 'sat', 'Sun']

def change_words(words, func):
    for word in words:
        print(func(word))
        
def sample_func(word):
    return word.capitalize()

change_words(l, sample_func())
result
Mon
Tue
Wed
Thu
Fri
Sat
Sun

普通に記述するとこのようになる。

####◆ラムダを使って記述する

l = ['Mon', 'tue', 'Wed', 'Thu', 'fri', 'sat', 'Sun']

def change_words(words, func):
    for word in words:
        print(func(word))

change_words(l, lambda word: word.capitalize())
result
Mon
Tue
Wed
Thu
Fri
Sat
Sun

引数として用いるfuncを
lambda word: word.capitalize()
と書くこととで、完結に記載することができる。

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