# Pythonの基礎 (Data Science & ML)

> 変数、データ型、制御構造、関数、モジュール、例外

- 25 面接問題
- Junior
- [面接問題: Data Science & ML](https://sharpskill.dev/ja/technologies/data-science/interview-questions.md)

## 1. Pythonにおける変数とは何ですか?

**回答**

Pythonにおける変数は、値を含むメモリ位置を参照する名前です。他の言語と異なり、Pythonは動的型付けを使用します。変数の型は代入時に自動的に決定されます。型を明示的に宣言する必要はありません。

## 2. Pythonで値3.14の型は何ですか?

**回答**

Pythonでは、3.14は浮動小数点数なので、float型です。整数(小数なし)はint型、小数部分を持つ数値は自動的にfloatとして扱われます。type()関数で値の型を確認できます。

## 3. Pythonで文字列"42"を整数に変換するにはどうすればよいですか?

**回答**

int()関数は、数値を表す文字列を整数に変換します。この操作はキャストまたは型変換と呼ばれます。文字列が有効な数値を表していない場合、ValueErrorが発生します。小数用のfloat()や文字列用のstr()もあります。

## さらに22問利用可能

- Pythonにおけるlistとtupleの違いは何ですか?
- Pythonで式bool("")は何を返しますか?

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