September 2024
Intermediate to advanced
1648 pages
52h 56m
Spanish
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Capítulo 36. Diseñar con excepciones
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Este capítulo completa la parte del libro con una recopilación de temas de diseño de excepciones y ejemplos de casos de uso comunes, seguidos de los errores y ejercicios de esta parte. Dado que este capítulo también cierra la parte de fundamentos del libro en general, también incluye una breve descripción de las herramientas de desarrollo para ayudarte en la migración de principiante a desarrollador de aplicaciones Python.
Anidamiento de manejadores de excepciones
La mayoría de nuestros ejemplos hasta ahora sólo han utilizado un único try para atrapar excepciones, pero ¿qué ocurre si un try está anidado físicamente dentro de otro? Para el caso, ¿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. He mencionado esto brevemente, pero aclaremos la idea aquí.
Ambos casos pueden entenderse si te das cuenta de que Python apila las sentencias tryen 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, Python puede saltar a trys anteriores inspeccionando los marcadores apilados. Este anidamiento de manejadores activos es ...
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