正規表現の知識を実践的なテキスト処理シナリオに適用。
段落を個々の文に分割する関数の作成。
各文はピリオド（`'.'`）、感嘆符（`'!'`）、または疑問符（`'?'`）で終わる。
文の後にはスペースや改行が続く場合があり、出力には句読点を各文に含めること。

**主な要件：**
- 正規表現用の `re` モジュールを使用；
- `'.'`、`'!'`、`'?'` で文の区切りを検出；
- 各文の末尾に句読点を含める；
- 各文の前後の空白を削除。

**入力例：**
```
paragraph = "Hello there! How are you? I hope you're enjoying learning Python."
```

**期待される出力：**
```
['Hello there!', 'How are you?', "I hope you're enjoying learning Python."]
```

このチャレンジを通じて、Pythonにおける正規表現による分割や文境界検出の理解を深める。


import unittest
import user_code
import ast
import re   
import unittest
import importlib

class TestTask(unittest.TestCase):
    def test_simple_split(self):
        import user_code
        importlib.reload(user_code)
        text = "Hello! How are you? I am fine."
        expected = ["Hello!", "How are you?", "I am fine."]
        result = user_code.split_sentences(text)
        _dynamic_test(
            self,
            isinstance(result, list) and result == expected,
            "Correctly splits sentences with !, ? and .",
            f"Expected {expected}, got {result}",
        )

    def test_trailing_spaces(self):
        import user_code
        importlib.reload(user_code)
        text = "Hello!   How are you?   I am fine.  "
        expected = ["Hello!", "How are you?", "I am fine."]
        result = user_code.split_sentences(text)
        _dynamic_test(
            self,
            isinstance(result, list) and result == expected,
            "Removes extra spaces between and after sentences.",
            f"Expected {expected}, got {result}",
        )

    def test_multiline_paragraph(self):
        import user_code
        importlib.reload(user_code)
        text = "Hello!\\nHow are you?\\nI am fine.\\n"
        expected = ["Hello!", "How are you?", "I am fine."]
        result = user_code.split_sentences(text)
        _dynamic_test(
            self,
            isinstance(result, list) and result == expected,
            "Handles newlines between sentences.",
            f"Expected {expected}, got {result}",
        )

    def test_empty_string(self):
        import user_code
        importlib.reload(user_code)
        text = ""
        expected = []
        result = user_code.split_sentences(text)
        _dynamic_test(
            self,
            isinstance(result, list) and result == expected,
            "Returns empty list for empty input.",
            f"Expected empty list, got {result}",
        )

    def test_no_sentence_endings(self):
        import user_code
        importlib.reload(user_code)
        text = "This is not a sentence ending"
        expected = []
        result = user_code.split_sentences(text)
        _dynamic_test(
            self,
            isinstance(result, list) and result == expected,
            "Returns empty list if no sentence-ending punctuation.",
            f"Expected empty list, got {result}",
        )

    def test_multiple_punctuation(self):
        import user_code
        importlib.reload(user_code)
        text = "Wait. . . What? ! Seriously? !"
        expected = ["Wait.", ".", ".", "What?", "!", "Seriously?", "!"]
        result = user_code.split_sentences(text)
        _dynamic_test(
            self,
            isinstance(result, list) and result == expected,
            "Handles consecutive punctuation marks individually.",
            f"Expected {expected}, got {result}",
        )

    def test_leading_trailing_whitespace(self):
        import user_code
        importlib.reload(user_code)
        text = "   Hello!  "
        expected = ["Hello!"]
        result = user_code.split_sentences(text)
        _dynamic_test(
            self,
            isinstance(result, list) and result == expected,
            "Removes leading and trailing whitespace from sentence.",
            f"Expected {expected}, got {result}",
        )

def _dynamic_test(test_case, condition, success_message, failure_message):
    if condition:
        test_case._testMethodName = success_message
        test_case.assertTrue(True, success_message)
    else:
        test_case._testMethodName = failure_message
        test_case.fail(failure_message)

def normalize_text(text):
    text = text.lower()
    text = re.sub(r"\s{2,}", " ", text)
    text = re.sub(r"\s*([,:?])\s*", r"\1 ", text)
    return text.strip()

def change_var(code: str, var_name: str, value: str) -> str:
    tree = ast.parse(code)
    lines = code.splitlines()
    for i, node in enumerate(tree.body):
        if isinstance(node, ast.Assign):
            for target in node.targets:
                if isinstance(target, ast.Name) and target.id == var_name:
                    start_line = node.lineno - 1
                    line = lines[start_line]
                    indent = ' ' * (len(line) - len(line.lstrip()))
                    lines[start_line] = f"{indent}{var_name} = {value}"
                    next_line = len(lines)
                    for next_node in tree.body[i+1:]:
                        if hasattr(next_node, 'lineno'):
                            next_line = next_node.lineno - 1
                            break
                    if next_line > start_line + 1:
                        lines[start_line+1:next_line] = []
                    
                    return '\\n'.join(lines)
    return code

if __name__ == "__main__":
    unittest.main()


test_main.py

基本的なPythonの知識を持つ学習者向けに設計された、Pythonの正規表現に関する包括的なコースです。本コースでは、正規表現の構文、パターンマッチング、高度な機能、理論と実践的な課題を通じた応用方法を扱います。

Pythonにおける正規表現の基礎、基本構文、パターンマッチング、主要な正規表現関数について学習します。

グルーピング、量指定子、アンカー、置換技法を用いた正規表現のさらなる深掘り。

先読み／後読み、非貪欲マッチングなどの高度な正規表現機能を習得し、実際のテキスト処理問題に正規表現を適用します。

チャレンジ：正規表現を使用した文の分割

解答