Summary  
This chapter shows how to delete an entire tuple using the del statement and how to remove specific elements by converting the tuple to a list, removing items, and converting it back to a tuple.

General domain of usage  
Data structure manipulation

Tuple Pythonissa on muuttumaton, eli kun se on luotu, sen alkioita ei voi muuttaa, lisätä tai poistaa. Koko tuplen voi kuitenkin poistaa käyttämällä `del`-lausetta.

movies = ("Inception", "Interstellar", "Tenet", "Dunkirk", "Memento")

# Deleting the tuple
del movies

# Attempting to print the deleted tuple will raise an error
print(movies)

Koska tuplet ovat muuttumattomia, niistä ei voi poistaa alkioita suoraan. Tämän voi kuitenkin kiertää muuntamalla tuplen listaksi, muokkaamalla listaa ja muuttamalla se takaisin tupleksi.

Huomio

movies = ("Inception", "Interstellar", "Tenet", "Dunkirk", "Memento")

# Convert the tuple to a list
movies_list = list(movies)

# Remove specific items
movies_list.remove("Tenet")
movies_list.remove("Dunkirk")

# Convert the list back to a tuple
movies = tuple(movies_list)

print(movies)

import unittest
import importlib
import re

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)

class TestUserCode(unittest.TestCase):

    def test_movie_poster_is_declared(self):
        import user_code
        _dynamic_test(
            self,
            hasattr(user_code, 'movie_poster'),
            "The `movie_poster` variable is declared.",
            "Expected `movie_poster` to be declared."
        )

    def test_movie_poster_is_tuple(self):
        import user_code
        _dynamic_test(
            self,
            isinstance(user_code.movie_poster, tuple),
            "The `movie_poster` is of type `tuple`.",
            "Expected `movie_poster` to be of type `tuple`."
        )

    def test_movie_poster_contains_correct_values(self):
        import user_code
        expected_values = ('Finding Nemo', '2001: A Space Odyssey', 'Interstellar', 'Gravity', 'The Martian')
        _dynamic_test(
            self,
            set(user_code.movie_poster) == set(expected_values),
            f"The `movie_poster` contains `{expected_values}`.",
            f"Expected `movie_poster` to contain `{expected_values}`, but got `{user_code.movie_poster}`."
        )

    def test_temp_list_deleted(self):
        import user_code
        _dynamic_test(
            self,
            not hasattr(user_code, 'temp_list'),
            "The `temp_list` variable was deleted.",
            "Expected `temp_list` to be deleted."
        )

    def test_list_function_used(self):
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()
        _dynamic_test(
            self,
            re.search(r'list\s*\(', user_code_source),
            "The `list()` function is used for tuple conversion.",
            "Expected the `list()` function to be used for tuple conversion."
        )

    def test_remove_method_used(self):
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()
        _dynamic_test(
            self,
            re.search(r'\.remove\s*\(', user_code_source),
            "The `remove()` method is used to remove elements.",
            "Expected the `remove()` method to be used to remove elements."
        )

    def test_tuple_function_used(self):
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()
        _dynamic_test(
            self,
            re.search(r'tuple\s*\(', user_code_source),
            "The `tuple()` function is used for conversion back to a tuple.",
            "Expected the `tuple()` function to be used for conversion back to a tuple."
        )

    def test_del_statement_used(self):
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()
        _dynamic_test(
            self,
            re.search(r'del\s+temp_list', user_code_source),
            "The `del` statement is used to delete `temp_list`.",
            "Expected the `del` statement to be used to delete `temp_list`."
        )

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

test_main.py

Tutustu Python-ohjelmointikielen keskeisiin tietorakenteisiin, kuten listoihin, sanakirjoihin, tuplihin ja joukkoihin, sekä opi hyödyntämään niitä tehokkaasti todellisten ohjelmointiongelmien ratkaisemisessa.

Mikä on lista? Lista on järjestetty kokoelma, jota voidaan muokata. Se sallii myös päällekkäiset alkiot.

Pythonin Tuplien Poistaminen

Alkioiden poistaminen

Ratkaisu

Pythonin Tuplien Poistaminen

Alkioiden poistaminen

Ratkaisu