March 2025
Intermediate to advanced
1172 pages
47h 52m
Spanish
Content preview from Aprender Python, 6.ª edición
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Capítulo 40. Metaclases y herencia
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En el Capítulo 39, exploramos los decoradores y estudiamos ejemplos de su uso. En este último capítulo técnico del libro, vamos a seguir centrándonos en los constructores de herramientas con una revisión en profundidad de otro tema avanzado: las metaclases, un protocolo para gestionar objetos de clase en lugar de sus instancias, introducido brevemente en el capítulo 32.
En un nivel básico, las metaclases amplían el modelo de inserción de código de los decoradores. Como aprendimos en el capítulo anterior, los decoradores nos permiten aumentar las funciones y clases interceptando su creación. Las metaclases también nos permiten interceptar y aumentar la creación de clases:proporcionan un gancho para insertar lógica adicional que se ejecutará en al final de una sentencia class, aunque de forma distinta a los decoradores.
Las metaclases también pueden proporcionar un comportamiento para las clases con métodos situados en un árbol de herencia separado que se omite para las instancias normales que no son clases. Aunque esto permite a las metaclases procesar sus clases instancia después de la creación, también complica la semántica de la clase y enreda la herencia,cuya definición completa puede concretarse finalmente aquí.
Como todos los temas tratados en esta parte del libro, éste es un tema avanzado que puede estudiarse según las necesidades. ...
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