exceptions from modules
Matthew D. Wood
woodm at equire.com
Fri Aug 24 01:30:27 CEST 2001
Ok, I posted half of this earlier, but something strange happend, so I
will try again. If there is a double post, I appologize.
I have a main program that imports a user-written module.
In that module, I want to raise a user-defined exception.
The try-except block is in the main program.
Normally, I would think of writing everything like this:
(somewhere deep inside the __main__ jungle...)
except my_module.my_exception, value :
However, I have seen PLENTY of examples of modules that seemingly defy
scoping rules in the way they present their exceptions to the world.
And instead you can write:
except my_exception, value :
How do they do that? Where is the exception defined?
I don't understand the 'global' key-word.
I don't believe in "from blah import *" so it's definitely not
I assume that the my_exception class inherits from Exception (or
one of it's children)
Now even worse is that I have 2 code examples, one that just works,
and one that can't find the exception. I don't understand. I have
banged my head against the wall A LOT on this one.
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