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困ったときのpartial

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Pythonの隠れ便利モジュール、functools

特にfunctools.partial関数めちゃくちゃ使います。

一部の引数を固定した関数を返す、といえばいいのか説明が難しいんですが。

sample.py
from functools import partial


def sayhello(message=u"hello", to=u"ryo"):
    print(u"{1}さん、{0}".format(message, to))


def main():
    sayhello()

    konnnichiwa = partial(sayhello, u"こんにちわ")

    konnnichiwa("nishizawa")
    konnnichiwa("takahashi")


if __name__ == "__main__":
    main()

を実行すると

> python sample.py
ryoさん、hello
nishizawaさん、こんにちわ
takahashiさん、こんにちわ

となります。

PySideのコールバック関数などをやっつけるときに活躍します

sporty
STU(スマイルテクノロジーユナイテッド株式会社) 代表取締役
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