April 2025
Intermediate to advanced
630 pages
12h 48m
Portuguese (Portugal, Brazil)
Content preview from Introduzindo Python, 2ª Edição
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Capítulo 4. Escolhe com se
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Se conseguires manter a cabeça fria quando todos à tua volta estão a perder a deles e a culpar-te, ...
Rudyard Kipling, If-
Nos capítulos anteriores, viste muitos exemplos de dados mas não fizeste muito com eles. A maioria dos exemplos de código usaram o interpretador interativo e foram curtos. Neste capítulo, aprendes como estruturar código Python, não apenas dados.
Muitas linguagens de computador utilizam caracteres como chavetas ({ e }) ou palavras-chave comobegin e endpara marcar secções de código. Nessas linguagens, é boa prática utilizar uma indentação consistente para tornar o teu programa mais legível para ti e para os outros. Existem até ferramentas para alinhar bem o teu código.
Quando estava a desenhar a linguagem que se tornou Python, Guido van Rossum decidiu que a indentação por si só era suficiente para definir a estrutura de um programa, e evitou escrever todos aqueles parênteses e chavetas.Python é invulgar neste uso de espaço em brancopara definir a estrutura do programa. É um dos primeiros aspectos que os recém-chegados notam, e pode parecer estranho para aqueles que têm experiência com outras linguagens. Acontece que depois de escrever Python durante algum tempo, parece natural, e deixas de reparar nisso. Até te habituas a fazer mais enquanto escreves menos.
Os nossos exemplos iniciais de código foram de uma linha. ...
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