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

En tuple i Python är oföränderlig, vilket innebär att när den väl har skapats kan du inte ändra, lägga till eller ta bort dess element. Däremot kan du ta bort hela tuplen med hjälp av `del`-satsen.

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

# Deleting the tuple
del movies

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

Eftersom tupler är oföränderliga kan du inte ta bort objekt direkt från dem. Du kan dock kringgå detta genom att konvertera tuplen till en lista, ändra listan och sedan konvertera tillbaka den till en tuppel.

Observera

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

Utforska de grundläggande datastrukturerna i programmeringsspråket Python, inklusive listor, ordböcker, tupler och mängder, och lär dig hur du tillämpar dem effektivt för att lösa verkliga programmeringsutmaningar.

Vad är en lista? En lista är en ordnad samling som kan modifieras. Den tillåter även dubbletter av element.

Ta Bort Tupler i Python

Ta bort objekt

Lösning

Ta Bort Tupler i Python

Ta bort objekt

Lösning