«

A new cookbook recipe suggesting two decorators @throws and @catches
for treatment of checked exceptions in Python:

http://aspn.activestate.com/ASPN/Coo.../Recipe/498131

This might be of practical interest for some and theoretical interest
for others - in particular those who know checked ex as a language
feature of Java.

Regards,
Kay

Kay Schluehr wrote:

> A new cookbook recipe suggesting two decorators @throws and @catches
> for treatment of checked exceptions in Python:
>
> http://aspn.activestate.com/ASPN/Coo.../Recipe/498131
>
> This might be of practical interest for some and theoretical interest
> for others - in particular those who know checked ex as a language
> feature of Java.

Probably not what you wanted:

>>> test()
Raises UncheckedExceptionError(exceptions.ZeroDivisionErr or) -> OK
Raises ZeroDivisionError -> OK
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "checked_exceptions.py", line 134, in test
test4(3,2)
UnboundLocalError: local variable 'test4' referenced before assignment

Peter

In message <. com>, Kay
Schluehr wrote:

> A new cookbook recipe suggesting two decorators @throws and @catches
> for treatment of checked exceptions in Python:
>
> http://aspn.activestate.com/ASPN/Coo.../Recipe/498131
>
> This might be of practical interest for some and theoretical interest
> for others - in particular those who know checked ex as a language
> feature of Java.

The trouble with having to declare every possible exception that a function
might throw is that it rapidly turns into a complete mess. That's why such
declarations are optional in C++, and only semi-mandatory in Java.

>> This might be of practical interest for some and theoretical interest
>> for others - in particular those who know checked ex as a language
>> feature of Java.
>
> The trouble with having to declare every possible exception that a
> function might throw is that it rapidly turns into a complete mess. That's
> why such declarations are optional in C++, and only semi-mandatory in
> Java.

I agree with you that they are a mess, and I usually wrap them
RuntimeExceptions.

Why do you call them semi-mandatory?

diez

Peter Otten wrote:
> Kay Schluehr wrote:
>
> > A new cookbook recipe suggesting two decorators @throws and @catches
> > for treatment of checked exceptions in Python:
> >
> > http://aspn.activestate.com/ASPN/Coo.../Recipe/498131
> >
> > This might be of practical interest for some and theoretical interest
> > for others - in particular those who know checked ex as a language
> > feature of Java.
>
> Probably not what you wanted:
>
> >>> test()
> Raises UncheckedExceptionError(exceptions.ZeroDivisionErr or) -> OK
> Raises ZeroDivisionError -> OK
> Traceback (most recent call last):
> File "<stdin>", line 1, in ?
> File "checked_exceptions.py", line 134, in test
> test4(3,2)
> UnboundLocalError: local variable 'test4' referenced before assignment
>
> Peter

Thanks, I fixed this.

Kay