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.