import unittest
import user_code
import ast
import re   
import importlib

class TestTask(unittest.TestCase):
    def test_power_up_double(self):
        import user_code
        importlib.reload(user_code)
        power_up_double = getattr(user_code, 'power_up_double', None)
        _dynamic_test(
            self,
            callable(power_up_double),
            "power_up_double is a function",
            "power_up_double is not defined as a function",
        )
        result = power_up_double(10) if power_up_double else None
        _dynamic_test(
            self,
            result == 20,
            "power_up_double(10) returns 20",
            f"power_up_double(10) did not return 20, got {result}",
        )

    def test_power_up_triple(self):
        import user_code
        importlib.reload(user_code)
        power_up_triple = getattr(user_code, 'power_up_triple', None)
        _dynamic_test(
            self,
            callable(power_up_triple),
            "power_up_triple is a function",
            "power_up_triple is not defined as a function",
        )
        result = power_up_triple(5) if power_up_triple else None
        _dynamic_test(
            self,
            result == 15,
            "power_up_triple(5) returns 15",
            f"power_up_triple(5) did not return 15, got {result}",
        )

    def test_different_multipliers(self):
        import user_code
        importlib.reload(user_code)
        create_power_up = getattr(user_code, 'create_power_up', None)
        _dynamic_test(
            self,
            callable(create_power_up),
            "create_power_up is a function",
            "create_power_up is not defined as a function",
        )
        double = create_power_up(2) if create_power_up else None
        half = create_power_up(0.5) if create_power_up else None
        r1 = double(7) if double else None
        r2 = half(8) if half else None
        _dynamic_test(
            self,
            r1 == 14,
            "Function with multiplier 2 returns correct result (7 * 2 == 14)",
            f"Expected 14, got {r1} for create_power_up(2)(7)",
        )
        _dynamic_test(
            self,
            r2 == 4.0,
            "Function with multiplier 0.5 returns correct result (8 * 0.5 == 4.0)",
            f"Expected 4.0, got {r2} for create_power_up(0.5)(8)",
        )

    def test_independent_closures(self):
        import user_code
        importlib.reload(user_code)
        create_power_up = getattr(user_code, 'create_power_up', None)
        _dynamic_test(
            self,
            callable(create_power_up),
            "create_power_up is a function",
            "create_power_up is not defined as a function",
        )
        up5 = create_power_up(5) if create_power_up else None
        up10 = create_power_up(10) if create_power_up else None
        r1 = up5(2) if up5 else None
        r2 = up10(2) if up10 else None
        _dynamic_test(
            self,
            r1 == 10 and r2 == 20,
            "Each closure keeps its own multiplier",
            f"Expected up5(2)==10 and up10(2)==20, got {r1} and {r2}",
        )

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
    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 not assign_nodes:
        return code
    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


test_main.py

Master packing/unpacking, flexible function arguments, higher-order functions, lambdas, variable scope, closures, iterators and decorators. Designed for learners who have completed an introductory Python course and want to write more efficient, expressive, and powerful code.

Explore the art of packing and unpacking lists, tuples, and dictionaries to write more expressive and efficient Python code.

Delve into the world of higher-order functions, passing functions as arguments, and writing concise anonymous functions with lambda.

Unravel the mysteries of variable scope, and learn how nested functions and closures enable powerful encapsulation.

Delve into Python's iteration protocol, custom iterators, and generator functions for efficient data processing.

Challenge: Power-up the Hero

Solution