On 7/4/2017 5:48 PM, David Mertz wrote:
If a method, why not a property?
Since the time to respond in human terms is trivial, I can imagine that this might be accepted. I just did not think of that option.
On Jul 4, 2017 2:41 PM, "Terry Reedy" <tjre...@udel.edu <mailto:tjre...@udel.edu>> wrote:On 7/4/2017 3:32 PM, David Mertz wrote: I don't see the usefulness rich exception data as at all as limited as this. Here's some toy code that shows a use: ---- # For some reason, imports might not be ready immediately # Maybe flaky network drive, maybe need to install modules, etc # The overall program can do things too make them available lazy_import("foo", "bar", "baz", "blat") while True: try: x = foo(1) * bar(2) + baz(3)**blat(4) break except NameError as err: lazy_import(err.name <http://err.name> <http://err.name>) sleep(1) Alternate proposal: give the NameError class a .name instance method that extracts the name from the message. This should not increase the time to create an instance. You would then write 'err.name <http://err.name>()' instead of 'err.name <http://err.name>'. For 3.6 def name(self): msg = self.args[0] return msg[6:msg.rindex("'")] # current test try: xyz except NameError as e: print(name(e) == 'xyz') # Exceptions unittest to ensure that the method # stays synchronized with future versions of instances def test_nameerror_name(self): try: xyz except NameError as e: self.assertEqual(e.name <http://e.name>(), 'xyz') Generalize to other exceptions. Further only-partially baked idea: Since exceptions are (in cpython) coded in C, I wonder if C data could be inexpensively attached to the instance to be retrieved and converted to python objects by methods when needed.-- Terry Jan Reedy_______________________________________________ Python-ideas mailing list Python-ideas@python.org <mailto:Python-ideas@python.org> https://mail.python.org/mailman/listinfo/python-ideas <https://mail.python.org/mailman/listinfo/python-ideas> Code of Conduct: http://python.org/psf/codeofconduct/ <http://python.org/psf/codeofconduct/> _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
-- Terry Jan Reedy _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
