November 2025
Intermediate to advanced
1172 pages
46h 25m
Portuguese (Portugal, Brazil)
Content preview from Aprendendo Python (Portuguese Edition), 1st Edition
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Capítulo 35. Objetosde exceção
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Até agora, este livro tem sido um pouco vago sobre o que realmente é uma exceção. Este capítulo esclarece o mistério, revelando os fatos por trás dos objetos de exceção — tanto os embutidos quanto os definidos pelo usuário. Como sugerido nos capítulos anteriores, as exceções são identificadas por objetos de instância de classe. É isso que é levantado e propagado ao longo do processamento de exceção , e a fonte da classe correspondente às cláusul except em instruções try.
Embora isso signifique que você deve usar programação orientada a objetos para definir novas exceções em seus programas — e introduza uma dependência de conhecimento lamentada na nota do capítulo anterior —, basear exceções em classes e OOP oferece vários benefícios. Entre eles, as exceções baseadas em classes oferecem suporte a:
- Categorias flexíveis de exceções
tryAs classes de exceção permitem que o código escolha a especificidade e facilitem as alterações futuras. Adicionar novas subclasses de exceção, por exemplo, não precisa exigir alterações nas instruçõ .- Informações de estado e comportamento
As classes de exceção fornecem um local natural para armazenar o contexto para uso no manipulador
try. Tanto os atributos quanto os métodos, por exemplo, estão disponíveis na instância levantada.- Reutilização por herança
As classes de exceção podem participar de hierarquias ...
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