For best performance (reduce time to build an exception object), I
would be interested to only format the error message on demand. For
example, when str(exception) is called.
The problem is the Exception.args attribute. Example:
$ ./python
Python 3.10.0a6+
>>> exc=AttributeError("%s object has no
I am not a Python developer, but I am very interested in this topic. While I
would definitely make use of any additional fields for exceptions as discussed,
it is already possible to find most, if not all of the information discussed in
PEP 473. To give just a concrete example taken from the PE
Since tweaking the built-in exceptions is so far-reaching, probably at
least discussing each proposed change (one at a time, not 5 at once) would
be the minimum. Otherwise you could do a PEP, but once again you're looking
at a PEP per exception. I think it's really going to come down to how big
of
Context: PEP 473 "Adding structured data to built-in exceptions"
proposed in 2014.
https://www.python.org/dev/peps/pep-0473/
Abstract: "Exceptions like AttributeError, IndexError, KeyError,
LookupError, NameError, TypeError, and ValueError do not provide all
information required by programmers to
