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Thu May 5 01:37:18 CEST 2005 · https://mail.python.org/pipermail/python-dev/2005-May/053369.html

Aahz wrote:

> My standard workaround is using exceptions, but I'm not sure how that
> interacts with a block:
> 
>     try:
>         for name in filenames:
>             with opened(name) as f:
>                 if f.read(2) == 0xFEB0:
>                     raise Found
>     except Found:
>         pass

For any sane block iterator, it will work as expected. However, an evil
block iterator could suppress the `Found` exception.

A sane block iterator should re-raise the original exception.

Tim Delaney

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[Python-Dev] PEP 340: Breaking out.