March 2025
Intermediate to advanced
1172 pages
47h 52m
Spanish
Content preview from Aprender Python, 6.ª edición
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Capítulo 36. Pistas de excepción
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Este capítulo completa esta parte del libro con la habitual recopilación de temas extraviados, ejemplos de uso común y conceptos de diseño, seguidos de las trampas y ejercicios de esta parte. Como este capítulo también cierra la parte de fundamentos del libro en general, incluye un breve resumen de conceptos y herramientas de desarrollo para ayudarte en la transición de principiante en el lenguaje Python a desarrollador de aplicaciones Python.
Anidamiento de manejadores de excepciones
La mayoría de nuestros ejemplos hasta ahora han utilizado un único try para capturar excepciones, pero ¿qué ocurre si un try está anidado físicamente dentro de otro? Por otra parte, ¿qué significa que un try llame a una función que ejecuta otro try? Técnicamente, las sentencias try pueden anidarse tanto desde el punto de vista de la sintaxis como del flujo de control en tiempo de ejecución a través de tu código. Esto ya se ha mencionado antes brevemente, pero merece una aclaración aquí.
Ambos casos pueden entenderse si te das cuenta de que Python apila las sentencias try en tiempo de ejecución. Cuando se produce una excepción, Python vuelve a la sentencia try introducida más recientemente con una cláusula except coincidente. Como cada sentencia try deja un marcador en la parte superior de una pila LIFO, Python puede volver a tryanteriores inspeccionando ...
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