
import unittest
import user_code
import ast
import re   
import importlib
import csv
import unittest
import importlib
import sys
import types

class TestTask(unittest.TestCase):
    def setUp(self):
        import user_code
        importlib.reload(user_code)
        self.user_code = user_code

    def test_notifier_is_abstract(self):
        Notifier = getattr(self.user_code, 'Notifier', None)
        _dynamic_test(
            self,
            Notifier is not None and hasattr(Notifier, '__abstractmethods__') and 'send' in Notifier.__abstractmethods__,
            "Notifier is an abstract base class with abstract method 'send'",
            "Notifier class is missing or does not have abstract method 'send'"
        )

    def test_email_notifier_inherits(self):
        EmailNotifier = getattr(self.user_code, 'EmailNotifier', None)
        Notifier = getattr(self.user_code, 'Notifier', None)
        _dynamic_test(
            self,
            EmailNotifier is not None and Notifier is not None and issubclass(EmailNotifier, Notifier),
            "EmailNotifier correctly inherits from Notifier",
            "EmailNotifier does not inherit from Notifier"
        )

    def test_sms_notifier_inherits(self):
        SMSNotifier = getattr(self.user_code, 'SMSNotifier', None)
        Notifier = getattr(self.user_code, 'Notifier', None)
        _dynamic_test(
            self,
            SMSNotifier is not None and Notifier is not None and issubclass(SMSNotifier, Notifier),
            "SMSNotifier correctly inherits from Notifier",
            "SMSNotifier does not inherit from Notifier"
        )

    def test_email_notifier_send(self):
        EmailNotifier = getattr(self.user_code, 'EmailNotifier', None)
        _dynamic_test(
            self,
            EmailNotifier is not None,
            "EmailNotifier class is defined",
            "EmailNotifier class is missing"
        )
        email = EmailNotifier()
        result = email.send("Test message")
        _dynamic_test(
            self,
            isinstance(result, str) and result.startswith("Email sent:"),
            "EmailNotifier.send returns correct string format",
            f"EmailNotifier.send returned: {result}"
        )

    def test_sms_notifier_send(self):
        SMSNotifier = getattr(self.user_code, 'SMSNotifier', None)
        _dynamic_test(
            self,
            SMSNotifier is not None,
            "SMSNotifier class is defined",
            "SMSNotifier class is missing"
        )
        sms = SMSNotifier()
        result = sms.send("Test message")
        _dynamic_test(
            self,
            isinstance(result, str) and result.startswith("SMS sent:"),
            "SMSNotifier.send returns correct string format",
            f"SMSNotifier.send returned: {result}"
        )

    def test_notify_user_polymorphism(self):
        notify_user = getattr(self.user_code, 'notify_user', None)
        EmailNotifier = getattr(self.user_code, 'EmailNotifier', None)
        SMSNotifier = getattr(self.user_code, 'SMSNotifier', None)
        _dynamic_test(
            self,
            notify_user is not None,
            "notify_user function is defined",
            "notify_user function is missing"
        )
        email = EmailNotifier()
        sms = SMSNotifier()
        email_result = notify_user(email, "Welcome!")
        sms_result = notify_user(sms, "Your code is 1234.")
        _dynamic_test(
            self,
            isinstance(email_result, str) and email_result.startswith("Email sent:"),
            "notify_user works with EmailNotifier",
            f"notify_user(EmailNotifier, ...) returned: {email_result}"
        )
        _dynamic_test(
            self,
            isinstance(sms_result, str) and sms_result.startswith("SMS sent:"),
            "notify_user works with SMSNotifier",
            f"notify_user(SMSNotifier, ...) returned: {sms_result}"
        )

    def test_example_usage(self):
        # Check that the example usage variables exist and are correct types
        email_notifier = getattr(self.user_code, 'email_notifier', None)
        sms_notifier = getattr(self.user_code, 'sms_notifier', None)
        notify_user = getattr(self.user_code, 'notify_user', None)
        _dynamic_test(
            self,
            email_notifier is not None and sms_notifier is not None,
            "Example usage objects are defined",
            "email_notifier or sms_notifier is missing"
        )
        result_email = notify_user(email_notifier, "Welcome!")
        result_sms = notify_user(sms_notifier, "Your code is 1234.")
        _dynamic_test(
            self,
            isinstance(result_email, str) and result_email.startswith("Email sent:"),
            "email_notifier works with notify_user",
            f"email_notifier with notify_user returned: {result_email}"
        )
        _dynamic_test(
            self,
            isinstance(result_sms, str) and result_sms.startswith("SMS sent:"),
            "sms_notifier works with notify_user",
            f"sms_notifier with notify_user returned: {result_sms}"
        )

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

Lär dig att bygga rena, säkra och skalbara applikationer med objektorienterad programmering i Python. Täcker grunderna i klasser och objekt, och går sedan vidare till avancerade koncept såsom arv, komposition, polymorfism och inkapsling. Med tydliga förklaringar och praktiska exempel utvecklar du förmågan att designa Python-program som är kraftfulla, underhållbara och redo för verklig användning.

Lär dig de grundläggande byggstenarna i objektorienterad programmering i Python. Denna sektion behandlar klasser, objekt, metoder och variabler och ger dig en solid grund för att förstå hur OOP organiserar och strukturerar kod.

Utmaning: Skapa en Ritning för ett Notifieringssystem

Lösning

Utmaning: Skapa en Ritning för ett Notifieringssystem

Lösning