Summary  
The `pop()` method in Python dictionaries removes a specified key-value pair and returns its value, raising a `KeyError` if the key is missing.

General domain of usage  
Inventory management systems, where items are dynamically added, removed, and tracked.

El método `pop()` en los diccionarios de Python permite eliminar un par clave-valor según su clave y devuelve el valor correspondiente. Este método es especialmente útil cuando se necesita extraer y procesar un valor mientras se elimina simultáneamente del diccionario.

La sintaxis es:

```python
dictionary.pop(key)
```

book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813,
    "copies": 5
}

# Remove the 'copies' key and retrieve its value
removed_copies = book.pop("copies")

print("Updated dictionary:", book)
print("Removed value:", removed_copies)

Si la clave no existe en el diccionario, Python genera una excepción `KeyError`.

book = {
    "title": "Pride and Prejudice",
    "author": "Jane Austen",
    "year": 1813
}

# Attempting to remove a non-existent key
removed_genre = book.pop("genre")

import unittest
import importlib

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_authors_books_is_declared(self):
        import user_code
        _dynamic_test(
            self,
            hasattr(user_code, 'authors_books'),
            "The `authors_books` dictionary is declared.",
            "Expected `authors_books` to be declared."
        )

    def test_authors_books_is_dict(self):
        import user_code
        _dynamic_test(
            self,
            isinstance(user_code.authors_books, dict),
            "The `authors_books` is of type `dict`.",
            "Expected `authors_books` to be of type `dict`."
        )

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

    def test_kings_books_is_list(self):
        import user_code
        _dynamic_test(
            self,
            isinstance(user_code.kings_books, list),
            "The `kings_books` is of type `list`.",
            "Expected `kings_books` to be of type `list`."
        )

    def test_kings_books_contains_correct_titles(self):
        import user_code
        expected_books = ['It', 'The Shining', 'Carrie', 'Misery']
        _dynamic_test(
            self,
            set(user_code.kings_books) == set(expected_books),
            "The `kings_books` list contains the correct books.",
            f"Expected `kings_books` to contain {expected_books}, but got {user_code.kings_books}."
        )

    def test_stephen_king_removed_from_authors_books(self):
        import user_code
        _dynamic_test(
            self,
            'Stephen King' not in user_code.authors_books,
            "The key `Stephen King` is successfully removed from `authors_books`.",
            "Expected `Stephen King` to be removed from `authors_books`."
        )

    def test_other_authors_exist(self):
        import user_code
        expected_authors = {
            'William Shakespeare', 'J.K. Rowling', 'George Orwell', 'Agatha Christie'
        }
        _dynamic_test(
            self,
            expected_authors.issubset(set(user_code.authors_books.keys())),
            "Other authors are still present in `authors_books`.",
            "Some expected authors are missing from `authors_books`."
        )

    def test_pop_method_used(self):
        with open('user_code.py', 'r') as file:
            user_code_source = file.read()
        _dynamic_test(
            self,
            "pop" in user_code_source,
            "The `pop()` method is used.",
            "Expected the `pop()` method to be used."
        )

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

test_main.py

Explora las estructuras de datos fundamentales del lenguaje de programación Python, incluyendo listas, diccionarios, tuplas y conjuntos, y aprende cómo aplicarlas de manera efectiva para resolver desafíos de programación del mundo real.

¿Qué es una lista? Una lista es una colección ordenada que puede modificarse. También permite elementos duplicados.

Eliminación de Elementos y Almacenamiento en Python

Solución

Eliminación de Elementos y Almacenamiento en Python

Solución