Python and checked exceptions

[Kay Schluehr]

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

http://aspn.activestate.com/ASPN/Cookbook/Python/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

 

[Peter Otten]

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

http://aspn.activestate.com/ASPN/Cookbook/Python/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:
Raises UncheckedExceptionError(exceptions.ZeroDivisionError) -> 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

 

[Lawrence D'Oliveiro]

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

http://aspn.activestate.com/ASPN/Cookbook/Python/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.

 

[Diez B. Roggisch]

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

 

[Kay Schluehr]

Probably not what you wanted:

Raises UncheckedExceptionError(exceptions.ZeroDivisionError) -> 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