Advent Calendar 2017 / Programming language

Pythonのコードを短く簡潔に書くテクニック Advent Calendar 2017

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Category：Programming language

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@tag1216

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。

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Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
26	27	28	29	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 to the terms of use	@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 to the terms of use
@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use
@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use
@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use
@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 to the terms of use	@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 to the terms of use	26	27	28	29	30

@tag1216
内包表記を使ってリストの作成を簡潔に書く
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@tag1216
namedtuple(名前付きタプル)で簡易クラスを作る
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@tag1216
itemgetter/attrgetterでsortedのkeyをスッキリさせる
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@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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@tag1216
dictの作成は「{}」より「dict()」のほうが簡潔に書ける
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@u1and0
pythonで三項演算子のネスト
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@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
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When you participate, we will assume that you have agreed to the terms of use
@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
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@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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@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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@tag1216
文字の変換にはstr.translate()が便利
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@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
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About reserved posting
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@tag1216
文字列リテラルのリストはstr.split()を使うと短く書ける
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When you participate, we will assume that you have agreed to the terms of use
@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
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When you participate, we will assume that you have agreed to the terms of use
@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
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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 to the terms of use
@tag1216
三項演算子を「a or b」という形式に書き直す
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Title
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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 to the terms of use
@tag1216
Pythonでは範囲条件を「a <= value < b」と書ける
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Title
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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.
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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 to the terms of use
@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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Title
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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 to the terms of use
@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 to the terms of use
@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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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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When you participate, we will assume that you have agreed to the terms of use
@wakame1367
enumerateで要素ごとのインデックスを表示しよう
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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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When you participate, we will assume that you have agreed to the terms of use
@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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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 to the terms of use
@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.
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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 to the terms of use
@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 to the terms of use
@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
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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 to the terms of use

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
26	27	28	29	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 to the terms of use	@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 to the terms of use
@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use
@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use
@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use	@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 to the terms of use
@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 to the terms of use	@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 to the terms of use	26	27	28	29	30

@tag1216
内包表記を使ってリストの作成を簡潔に書く
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@tag1216
namedtuple(名前付きタプル)で簡易クラスを作る
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@tag1216
itemgetter/attrgetterでsortedのkeyをスッキリさせる
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@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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@tag1216
dictの作成は「{}」より「dict()」のほうが簡潔に書ける
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@u1and0
pythonで三項演算子のネスト
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@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
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@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
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@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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@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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@tag1216
文字の変換にはstr.translate()が便利
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@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
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@tag1216
文字列リテラルのリストはstr.split()を使うと短く書ける
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@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
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@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
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@tag1216
三項演算子を「a or b」という形式に書き直す
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@tag1216
Pythonでは範囲条件を「a <= value < b」と書ける
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@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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@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
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@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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@wakame1367
enumerateで要素ごとのインデックスを表示しよう
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@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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@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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@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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@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
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