a name for the ExceptHandler.type when it is a literal tuple of types
That's this bit: ``` except (A, B): ^^^^^^ ``` bpo-43149 currently calls it an "exception group", but that conflicts with PEP 654 -- Exception Groups and except* ```
try: ... pass ... except A, B: ... pass Traceback (most recent call last): SyntaxError: exception group must be parenthesized
some alternatives:
exception classinfo must be parenthesized (classinfo so named from the parameter to issubclass)
exception sequence must be parenthesized
see also:
- https://github.com/python/cpython/pull/24467#discussion_r628756347
- https://www.python.org/dev/peps/pep-0654/
On Sat, May 8, 2021 at 8:54 AM Thomas Grainger <tagrain@gmail.com> wrote:
That's this bit:
``` except (A, B): ^^^^^^ ```
bpo-43149 currently calls it an "exception group", but that conflicts with PEP 654 -- Exception Groups and except*
```
try: ... pass ... except A, B: ... pass Traceback (most recent call last): SyntaxError: exception group must be parenthesized
some alternatives: exception classinfo must be parenthesized (classinfo so named from the parameter to issubclass) exception sequence must be parenthesized see also: - https://github.com/python/cpython/pull/24467#discussion_r628756347 - https://www.python.org/dev/peps/pep-0654/
Given it requires ()s it is probably better to call it an "exception sequence" or even go fully to "exception tuple" in order to avoid confusion and tie in with the other meanings of the required syntax. -gps
There's a PR to use "SyntaxError: multiple exception types must be parenthesized" https://github.com/python/cpython/pull/25996 On Sat, 8 May 2021, 19:20 Gregory P. Smith, <greg@krypto.org> wrote:
On Sat, May 8, 2021 at 8:54 AM Thomas Grainger <tagrain@gmail.com> wrote:
That's this bit:
``` except (A, B): ^^^^^^ ```
bpo-43149 currently calls it an "exception group", but that conflicts with PEP 654 -- Exception Groups and except*
```
try: ... pass ... except A, B: ... pass Traceback (most recent call last): SyntaxError: exception group must be parenthesized
some alternatives: exception classinfo must be parenthesized (classinfo so named from the parameter to issubclass) exception sequence must be parenthesized see also: - https://github.com/python/cpython/pull/24467#discussion_r628756347 - https://www.python.org/dev/peps/pep-0654/Given it requires ()s it is probably better to call it an "exception sequence" or even go fully to "exception tuple" in order to avoid confusion and tie in with the other meanings of the required syntax.
-gps
I propose “exception tuple”, since syntactically and semantically it must be a tuple. (Same as for isinstance() and issubclass().) On Sat, May 8, 2021 at 05:52 Thomas Grainger <tagrain@gmail.com> wrote:
That's this bit:
``` except (A, B): ^^^^^^ ```
bpo-43149 currently calls it an "exception group", but that conflicts with PEP 654 -- Exception Groups and except*
```
try: ... pass ... except A, B: ... pass Traceback (most recent call last): SyntaxError: exception group must be parenthesized
some alternatives: exception classinfo must be parenthesized (classinfo so named from the parameter to issubclass) exception sequence must be parenthesized see also: - https://github.com/python/cpython/pull/24467#discussion_r628756347 - https://www.python.org/dev/peps/pep-0654/ _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-leave@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/HSN6ESRB4BD6IUIPKLMNP4TPBQPWHBFK/ Code of Conduct: http://python.org/psf/codeofconduct/
-- --Guido (mobile)
Would it be possible to drop the requirement that multiple exception types are parenthesized? Is it only ambiguous with the old Python2 syntax? On Sat, 8 May 2021, 20:15 Guido van Rossum, <guido@python.org> wrote:
I propose “exception tuple”, since syntactically and semantically it must be a tuple. (Same as for isinstance() and issubclass().)
On Sat, May 8, 2021 at 05:52 Thomas Grainger <tagrain@gmail.com> wrote:
That's this bit:
``` except (A, B): ^^^^^^ ```
bpo-43149 currently calls it an "exception group", but that conflicts with PEP 654 -- Exception Groups and except*
```
try: ... pass ... except A, B: ... pass Traceback (most recent call last): SyntaxError: exception group must be parenthesized
some alternatives: exception classinfo must be parenthesized (classinfo so named from the parameter to issubclass) exception sequence must be parenthesized see also: - https://github.com/python/cpython/pull/24467#discussion_r628756347 - https://www.python.org/dev/peps/pep-0654/ _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-leave@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/HSN6ESRB4BD6IUIPKLMNP4TPBQPWHBFK/ Code of Conduct: http://python.org/psf/codeofconduct/-- --Guido (mobile)
That’s a discussion for another day. On Sat, May 8, 2021 at 09:17 Thomas Grainger <tagrain@gmail.com> wrote:
Would it be possible to drop the requirement that multiple exception types are parenthesized? Is it only ambiguous with the old Python2 syntax?
On Sat, 8 May 2021, 20:15 Guido van Rossum, <guido@python.org> wrote:
I propose “exception tuple”, since syntactically and semantically it must be a tuple. (Same as for isinstance() and issubclass().)
On Sat, May 8, 2021 at 05:52 Thomas Grainger <tagrain@gmail.com> wrote:
That's this bit:
``` except (A, B): ^^^^^^ ```
bpo-43149 currently calls it an "exception group", but that conflicts with PEP 654 -- Exception Groups and except*
```
try: ... pass ... except A, B: ... pass Traceback (most recent call last): SyntaxError: exception group must be parenthesized
some alternatives: exception classinfo must be parenthesized (classinfo so named from the parameter to issubclass) exception sequence must be parenthesized see also: - https://github.com/python/cpython/pull/24467#discussion_r628756347 - https://www.python.org/dev/peps/pep-0654/ _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-leave@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/HSN6ESRB4BD6IUIPKLMNP4TPBQPWHBFK/ Code of Conduct: http://python.org/psf/codeofconduct/-- --Guido (mobile)
-- --Guido (mobile)
I opened a new thread here: https://mail.python.org/archives/list/python-ideas@python.org/thread/WQOMBT4...
participants (3)
-
Gregory P. Smith -
Guido van Rossum -
Thomas Grainger