March 2025
Intermediate to advanced
1172 pages
47h 52m
Spanish
Content preview from Aprender Python, 6.ª edición
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Capítulo 16. Funciones básicas
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En la Parte III estudiamos las sentencias procedimentales básicas de Python. Aquí pasaremos a explorar un conjunto de sentencias y expresiones adicionales que podemos utilizar para crear nuestras propias funciones.
En términos sencillos, una función es un paquete de código invocado por un nombre. Etiqueta y agrupa un conjunto de sentencias para que puedan ejecutarse más de una vez en un programa. Una función también puede calcular un valor resultante, y nos permite especificar parámetros que sirven como entradas y pueden diferir cada vez que se ejecuta el código de la función. Envolver una operación en una función la convierte en una herramienta de utilidad general, que podemos aplicar en diversos contextos.
En un plano más pragmático, las funciones son la alternativa a programar cortando y pegando: enlugar de tener varias copias redundantes del código de una operación, podemos factorizarlo en una única función. Al hacerlo, reducimos radicalmente nuestro trabajo futuro: si hay que cambiar la operación más adelante, sólo tenemos una copia que actualizar en la función, no muchas dispersas por todo el programa.
Las funciones son también la estructura más básica del programa que proporciona Python para maximizar la reutilización del código, y nos conducen a las nociones más amplias del diseño de programas. Como verás, las funciones nos ...
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