Pythonのコードを短く簡潔に書くための方法を紹介していくカレンダーです。

一つ一つの記事はタイトル出落ちレベルの短いもので構いません。カレンダー全体で(主に初心者にとって)有益なTIPS集になることを目指します。

ルール

• 標準モジュールのみでできること
• タグまたは本文でPythonバージョンを明記すること

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26 26	27 27	28 28	29 29	30 30	@tag1216 内包表記を使ってリストの作成を簡潔に書く Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 namedtuple(名前付きタプル)で簡易クラスを作る Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin
@tag1216 itemgetter/attrgetterでsortedのkeyをスッキリさせる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 dictで一つのキーに複数の値を持ちたい時の実装方法 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 dictの作成は「{}」より「dict()」のほうが簡潔に書ける Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@u1and0 pythonで三項演算子のネスト Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 既存のlistに複数の値を一度に追加したいときは「+=」または「extend()」を使うと1行で書ける Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 既存のdictに複数の値を一度に追加したいときはupdate()を使うと1行で書ける Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@wakame1367 単語の出現頻度を計算するときはCounterを使おう Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin
@tag1216 実は内包表記を使わなくてもいい場合もある Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 文字の変換にはstr.translate()が便利 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 長い文字列リテラルの定義にはヒアドキュメントや('...' '...')が便利 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 文字列リテラルのリストはstr.split()を使うと短く書ける Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 Python3.6で導入されたフォーマット済み文字列リテラル(f'...')を使えばstr.format()より短く書ける Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 raw文字列(r'...')を使うとエスケープが多い文字列が楽に書ける Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 三項演算子を「a or b」という形式に書き直す Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin
@tag1216 Pythonでは範囲条件を「a <= value < b」と書ける Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 コンテキストマネージャーを使った処理時間の計測 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 Python3.2以降でのマルチタスク処理はThreadではなくconcurrent.futuresを使え Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 Python3ではcsvモジュールを使わなくてもCSVを出力できる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@wakame1367 enumerateで要素ごとのインデックスを表示しよう Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@wakame1367 同じ長さのリストを同時にループするにはzip関数が便利 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@wakame1367 重複する要素を除去するにはset関数を使おう Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin
@tag1216 演算子をオーバーロードしてメソッド呼び出しを簡略化する Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	@tag1216 デスクリプタ(descriptor)で属性へのアクセスロジックを共通化 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed tothe terms of use CancelJoin	26 26	27 27	28 28	29 29	30 30

1. 

   @tag1216

   内包表記を使ってリストの作成を簡潔に書く

   Overwrite

   Title

   URL

   You can post either your article on Qiita or your blog post.

   About reserved posting

   If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

   About posting period

   Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

   When you participate, we will assume that you have agreed tothe terms of use

   CancelJoin
2. 

   @tag1216

   namedtuple(名前付きタプル)で簡易クラスを作る

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   You can post either your article on Qiita or your blog post.

   About reserved posting

   If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

   About posting period

   Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

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   CancelJoin
3. 

   @tag1216

   itemgetter/attrgetterでsortedのkeyをスッキリさせる

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   You can post either your article on Qiita or your blog post.

   About reserved posting

   If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

   About posting period

   Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

   When you participate, we will assume that you have agreed tothe terms of use

   CancelJoin
4. 

   @tag1216

   dictで一つのキーに複数の値を持ちたい時の実装方法

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   About reserved posting

   If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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   CancelJoin
5. 

   @tag1216

   dictの作成は「{}」より「dict()」のほうが簡潔に書ける

   Overwrite

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   About reserved posting

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   CancelJoin
6. 

   @u1and0

   pythonで三項演算子のネスト

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   If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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   Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

   When you participate, we will assume that you have agreed tothe terms of use

   CancelJoin
7. 

   @tag1216

   既存のlistに複数の値を一度に追加したいときは「+=」または「extend()」を使うと1行で書ける

   Overwrite

   Title

   URL

   You can post either your article on Qiita or your blog post.

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   Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

   When you participate, we will assume that you have agreed tothe terms of use

   CancelJoin
8. 

   @tag1216

   既存のdictに複数の値を一度に追加したいときはupdate()を使うと1行で書ける

   Overwrite

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   URL

   You can post either your article on Qiita or your blog post.

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9. 

   @wakame1367

   単語の出現頻度を計算するときはCounterを使おう

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10. 

    @tag1216

    実は内包表記を使わなくてもいい場合もある

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11. 

    @tag1216

    文字の変換にはstr.translate()が便利

    Overwrite

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    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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    CancelJoin
12. 

    @tag1216

    長い文字列リテラルの定義にはヒアドキュメントや('...' '...')が便利

    Overwrite

    Title

    URL

    You can post either your article on Qiita or your blog post.

    About reserved posting

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    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed tothe terms of use

    CancelJoin
13. 

    @tag1216

    文字列リテラルのリストはstr.split()を使うと短く書ける

    Overwrite

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    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

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    CancelJoin
14. 

    @tag1216

    Python3.6で導入されたフォーマット済み文字列リテラル(f'...')を使えばstr.format()より短く書ける

    Overwrite

    Title

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15. 

    @tag1216

    raw文字列(r'...')を使うとエスケープが多い文字列が楽に書ける

    Overwrite

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    CancelJoin
16. 

    @tag1216

    三項演算子を「a or b」という形式に書き直す

    Overwrite

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    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed tothe terms of use

    CancelJoin
17. 

    @tag1216

    Pythonでは範囲条件を「a <= value < b」と書ける

    Overwrite

    Title

    URL

    You can post either your article on Qiita or your blog post.

    About reserved posting

    If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.

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    Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)

    When you participate, we will assume that you have agreed tothe terms of use

    CancelJoin
18. 

    @tag1216

    コンテキストマネージャーを使った処理時間の計測

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19. 

    @tag1216

    Python3.2以降でのマルチタスク処理はThreadではなくconcurrent.futuresを使え

    Overwrite

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    URL

    You can post either your article on Qiita or your blog post.

    About reserved posting

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20. 

    @tag1216

    Python3ではcsvモジュールを使わなくてもCSVを出力できる

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21. 

    @wakame1367

    enumerateで要素ごとのインデックスを表示しよう

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22. 

    @wakame1367

    同じ長さのリストを同時にループするにはzip関数が便利

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23. 

    @wakame1367

    重複する要素を除去するにはset関数を使おう

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24. 

    @tag1216

    演算子をオーバーロードしてメソッド呼び出しを簡略化する

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25. 

    @tag1216

    デスクリプタ(descriptor)で属性へのアクセスロジックを共通化

    Overwrite

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    When you participate, we will assume that you have agreed tothe terms of use

    CancelJoin