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

class TestTask(unittest.TestCase):
    def test_unpack_first_last_typical(self):
        import user_code
        importlib.reload(user_code)
        func = getattr(user_code, 'unpack_first_last', None)
        _dynamic_test(
            self,
            callable(func),
            "Function 'unpack_first_last' is defined.",
            "Function 'unpack_first_last' is not defined."
        )
        result = func([1, 2, 3, 4, 5, 6]) if func else None
        expected = (1, 2, 5, 6)
        _dynamic_test(
            self,
            result == expected,
            "Correct tuple for list [1, 2, 3, 4, 5, 6]",
            f"Expected {expected}, got {result}"
        )

    def test_unpack_first_last_strings(self):
        import user_code
        importlib.reload(user_code)
        func = getattr(user_code, 'unpack_first_last', None)
        result = func(['a', 'b', 'c', 'd']) if func else None
        expected = ('a', 'b', 'c', 'd')
        _dynamic_test(
            self,
            result == expected,
            "Correct tuple for list ['a', 'b', 'c', 'd']",
            f"Expected {expected}, got {result}"
        )

    def test_unpack_first_last_five_elements(self):
        import user_code
        importlib.reload(user_code)
        func = getattr(user_code, 'unpack_first_last', None)
        result = func([10, 20, 30, 40, 50]) if func else None
        expected = (10, 20, 40, 50)
        _dynamic_test(
            self,
            result == expected,
            "Correct tuple for list [10, 20, 30, 40, 50]",
            f"Expected {expected}, got {result}"
        )

    def test_unpack_first_last_four_elements(self):
        import user_code
        importlib.reload(user_code)
        func = getattr(user_code, 'unpack_first_last', None)
        result = func([7, 8, 9, 10]) if func else None
        expected = (7, 8, 9, 10)
        _dynamic_test(
            self,
            result == expected,
            "Correct tuple for list [7, 8, 9, 10]",
            f"Expected {expected}, got {result}"
        )

    def test_unpack_first_last_too_short(self):
        import user_code
        importlib.reload(user_code)
        func = getattr(user_code, 'unpack_first_last', None)
        failed = False
        try:
            func([1, 2, 3])
        except Exception:
            failed = True
        _dynamic_test(
            self,
            failed,
            "Function raises exception for list shorter than 4 elements.",
            "Function should raise exception for lists shorter than 4 elements."
        )

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

Bliv fortrolig med pakning/udpaking, fleksible funktionsargumenter, højere-ordens funktioner, lambdaer, variabelscope, closures, iteratorer og dekoratører. Udviklet til kursister, der har gennemført et introduktionskursus i Python og ønsker at skrive mere effektiv, udtryksfuld og kraftfuld kode.

Udforsk kunsten at pakke og udpakke lister, tupler og ordbøger for at skrive mere udtryksfuld og effektiv Python-kode.

Dyk ned i verdenen af højereordensfunktioner, overførsel af funktioner som argumenter og skrivning af korte anonyme funktioner med lambda.

Opdag hemmelighederne bag variabelscope, og lær hvordan indlejrede funktioner og closures muliggør effektiv indkapsling.

Dyk ned i Pythons iterationsprotokol, brugerdefinerede iteratorer og generatorfunktioner for effektiv databehandling.

Challenge: Udpakning af Flere Elementer

Løsning