hasattr() 与 try-except 块处理不存在的属性

问题描述

if hasattr(obj, 'attribute'):
    # do somthing

对

try:
    # access obj.attribute
except AttributeError, e:
    # deal with AttributeError

应该首选哪个以及为什么?

Which should be preferred and why?

推荐答案

hasattr 在内部快速执行与 try/except 块相同的任务:这是一个非常具体的，经过优化的单任务工具，因此在适用时应优先于非常通用的替代方案.

hasattr internally and rapidly performs the same task as the try/except block: it's a very specific, optimized, one-task tool and thus should be preferred, when applicable, to the very general-purpose alternative.

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