April 2025
Intermediate to advanced
630 pages
12h 48m
Portuguese (Portugal, Brazil)
Content preview from Introduzindo Python, 2ª Edição
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Capítulo 7. Tuplas e listas
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O animal humano distingue-se dos primatas menores pela sua paixão pelas listas.
H. Allen Smith
Nos capítulos anteriores, começámos com alguns dos tipos de dados básicos do Python: booleanos, inteiros, floats e strings. Se pensares neles como átomos, as estruturas de dados neste capítulo são como moléculas. Ou seja, combinamos esses tipos básicos de formas mais complexas. Vais usá-los todos os dias. Grande parte da programação consiste em cortar e colar dados em formas específicas, e estas são as tuas serras e pistolas de cola.
A maioria das linguagens de computador pode representar uma sequência de itens indexados pela sua posição inteira: primeiro, segundo, e assim por diante até ao último. Já viste as strings Python, que são sequências de caracteres.
Python tem duas outras estruturas de sequência:tuplas e listas. Estas contêm zero ou mais elementos. Ao contrário das strings, os elementos podem ser de diferentes tipos. De facto, cada elemento pode ser qualquer objeto Python. Isto permite-te criar estruturas tão profundas e complexas quanto quiseres.
Porque é que o Python contém listas e tuplas? As tuplas são imutáveis; quando atribuis elementos (apenas uma vez) a uma tupla, eles são incorporados no bolo e não podem ser alterados. As listas são mutáveis, o que significa que podes inserir e apagar elementos com grande entusiasmo. ...
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