August 2024
Intermediate to advanced
1014 pages
26h
Spanish
Content preview from Python fluido, 2ª edición
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Capítulo 17. Iteradores, generadoresy coroutines clásicas
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Cuando veo patrones en mis programas, lo considero una señal de problemas. La forma de un programa debe reflejar únicamente el problema que debe resolver. Cualquier otra regularidad en el código es señal, al menos para mí, de que estoy utilizando abstracciones que no son lo suficientemente potentes, a menudo de que estoy generando a mano las expansiones de alguna macro que necesito escribir.
Paul Graham, hacker de Lisp y capitalista de riesgo1
Iteración es fundamental para el procesamiento de datos: los programas aplican cálculos a series de datos, desde píxeles a nucleótidos. Si los datos no caben en la memoria, necesitamos obtener los elementos perezosamente, de unoen uno y bajo demanda. Eso es lo que hace un iterador. Este capítulo muestra cómo el patrón de diseño Iterador está integrado en el lenguaje Python para que nunca tengas que codificarlo a mano.
Todas las colecciones estándar de Python son iterables. Un iterable es un objeto que proporciona un iterador, que Python utiliza para soportar operaciones como:
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forbucles -
Comprensiones de lista, dict y conjunto
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Desembalaje de tareas
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Construcción de instancias de recogida
Este capítulo de trata los siguientes temas:
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Cómo utiliza Python la función incorporada
iter()para manejar objetos iterables -
Cómo implementar el patrón Iterador clásico ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.