In this piece of code, why does using 'for' result in no 'StopIteration' or is the 'for' loop trapping all exceptions and then silently exiting? In which case, why do we have the extraneous 'return'?? Or is the In this piece of code, why does using 'for' res
阅读背景：
为什么next会出现“StopIteration”，而“for”则是正常返回?
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