On Thu, Nov 12, 2009 at 12:00 AM, alex23 <wuwe...@gmail.com> wrote: > On Nov 12, 2:46 pm, Peng Yu <pengyu...@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.
It is true that an exception class is usually defined in a module and all the exceptions raised in this module should be of this derived class? Is it the general practice in python? -- http://mail.python.org/mailman/listinfo/python-list
