September 2024
Intermediate to advanced
1648 pages
52h 56m
Spanish
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Capítulo 33. Conceptos básicos sobre excepciones
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Esta parte del libro trata de las excepciones, que son eventos que pueden modificar el flujo de control a través de un programa. En Python, las excepciones se activan automáticamente en caso de error, y pueden ser activadas e interceptadas por tu código. Se procesan mediante cuatro sentencias que estudiaremos en esta parte, la primera de las cuales tiene dos variaciones (enumeradas aquí por separado) y la última fue una extensión opcional hasta Python 2.6 y 3.0:
try/exceptCatch y se recuperan de las excepciones planteadas por Python, o por ti.
try/finallyRealiza acciones de limpieza , tanto si se producen excepciones como si no.
raiseActiva una excepción manualmente en tu código.
assertCondicionalmente provoca una excepción en tu código.
with/asImplementar gestores de contexto en Python 2.6, 3.0 y posteriores (opcional en 2.5).
Este tema se ha dejado para casi el final del libro porque necesitas conocer las clases para codificar tus propias excepciones. Sin embargo, salvo algunas excepciones (valga el juego de palabras), verás que el manejo de excepciones es sencillo en Python porque está integrado en el propio lenguaje como otra herramienta de alto nivel.
¿Por qué utilizar excepciones?
En pocas palabras, las excepciones nos permiten saltarnos trozos arbitrariamente grandes de un programa. Considera el robot hipotético que ...
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