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

class TestTask(unittest.TestCase):

    def test_instance_increments_total_users(self):
        import user_code
        importlib.reload(user_code)
        cls = getattr(user_code, 'User', None)
        # Reset class variable for test
        cls.total_users = 0
        u1 = cls("alice")
        u2 = cls("bob")
        u3 = cls("carol")
        _dynamic_test(self, cls.total_users == 3, "total_users increments with each instance", f"Expected total_users to be 3, got {cls.total_users}")

    def test_username_stored(self):
        import user_code
        importlib.reload(user_code)
        cls = getattr(user_code, 'User', None)
        # Reset class variable for test
        cls.total_users = 0
        u = cls("dave")
        username = getattr(u, 'username', None)
        _dynamic_test(self, username == "dave", "username instance variable is set correctly", f"Expected username 'dave', got {username}")

    def test_get_info_returns_tuple(self):
        import user_code
        importlib.reload(user_code)
        cls = getattr(user_code, 'User', None)
        # Reset class variable for test
        cls.total_users = 0
        u1 = cls("eve")
        u2 = cls("frank")
        res1 = u1.get_info() if u1 is not None else None
        res2 = u2.get_info() if u2 is not None else None
        _dynamic_test(self, isinstance(res1, tuple) and res1[0] == "eve" and res1[1] == 2, "get_info returns correct tuple for u1", f"Expected ('eve', 2), got {res1}")
        _dynamic_test(self, isinstance(res2, tuple) and res2[0] == "frank" and res2[1] == 2, "get_info returns correct tuple for u2", f"Expected ('frank', 2), got {res2}")

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()
    changed = False
    # Collect all assignment nodes to modify
    assign_nodes = [
        (i, node)
        for i, node in enumerate(tree.body)
        if isinstance(node, ast.Assign)
        and any(isinstance(target, ast.Name) and target.id == var_name for target in node.targets)
    ]

    # If nothing to change, return unmodified code
    if not assign_nodes:
        return code

    # Perform replacements for all matching assignments (from last to first to not break line offsets)
    for i, node in reversed(assign_nodes):
        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] = []
        changed = True

    return '\\n'.join(lines) if changed else code

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


test_main.py

Pythonのオブジェクト指向プログラミングを用いて、クリーンで安全かつスケーラブルなアプリケーションの構築方法を学びます。クラスとオブジェクトの基礎から始まり、継承、コンポジション、多態性、カプセル化などの高度な概念へと進みます。明確な解説と実践的な例を通じて、強力で保守性が高く、実用的なPythonプログラムを設計する能力を身につけます。

Pythonにおけるオブジェクト指向プログラミングの基本的な構成要素を学びます。このセクションでは、クラス、オブジェクト、メソッド、変数について解説し、OOPがどのようにコードを整理・構造化するかの確かな基礎を提供します。

チャレンジ：インスタンス変数とクラス変数の操作

解答