Why Error is derived from EnvironmentError in shutil.py?

alex23 wuwei23 at gmail.com
Thu Nov 12 07:00:48 CET 2009


On Nov 12, 2:46 pm, Peng Yu <pengyu... at gmail.com> wrote:
> I see Error is derived from EnvironmentError in shutil.py.
>
> class Error(EnvironmentError):
>     pass
>
> I'm wondering why EnvironmentError can not be raised directly. Why
> Error is raised instead?

This way you can explicitly trap on shutil.Error and not intercept any
other EnvironmentError that might be raised.

And as it's a descendent of EnvironmentError, it can still be caught
by any handlers looking for such exceptions.



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