[issue9259] Python 2.7 breaks assigned __exit__s
Changes by Dave Malcolm dmalc...@redhat.com: -- nosy: +dmalcolm ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
New submission from Ariel Ben-Yehuda ariel@gmail.com: Hello, I think there is a problem with Python 2.7: I installed it, and tried to compile GObject-Introspection 0.9.2. Here is the result: ... GISCAN GLib-2.0.gir Traceback (most recent call last): File ../tools/g-ir-scanner, line 36, in module from giscanner.scannermain import scanner_main File /sources/gobject-introspection-0.9.2/giscanner/scannermain.py, line 31, in module from giscanner.dumper import compile_introspection_binary File /sources/gobject-introspection-0.9.2/giscanner/dumper.py, line 26, in module from .glibtransformer import IntrospectionBinary File /sources/gobject-introspection-0.9.2/giscanner/glibtransformer.py, line 34, in module from .transformer import Names File /sources/gobject-introspection-0.9.2/giscanner/transformer.py, line 31, in module from .girparser import GIRParser File /sources/gobject-introspection-0.9.2/giscanner/girparser.py, line 32, in module from .girwriter import COMPATIBLE_GIR_VERSION File /sources/gobject-introspection-0.9.2/giscanner/girwriter.py, line 30, in module from .xmlwriter import XMLWriter File /sources/gobject-introspection-0.9.2/giscanner/xmlwriter.py, line 70, in module with LibtoolImporter: AttributeError: __exit__ Oops, no GObject-Introspection for me. Investigating the bug, I looked in the recent changes in Python2.7 for something interesting, and found this: A new opcode was added to perform the initial setup for with statements, looking up the __enter__() and __exit__() methods. (Contributed by Benjamin Peterson.) Finally, I made 3 test cases to the bug. All 3 produce no input in Python 2.6, but crash pretty nicely in 2.7, the first 2 not finding __exit__ and the last missing __enter__. I will try to make a patch, however my CPython skills are not so great, so you will probably make a better one. -- components: Interpreter Core files: tests.tar.xz messages: 110268 nosy: arielbyd priority: normal severity: normal status: open title: Python 2.7 breaks assigned __exit__s versions: Python 2.7 Added file: http://bugs.python.org/file17996/tests.tar.xz ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Changes by Antoine Pitrou pit...@free.fr: -- nosy: +benjamin.peterson ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Éric Araujo mer...@netwok.org added the comment: Thank you for the report. Unfortunately, the 2.6 behavior was a bug, as I explained on #9220: Magic methods are looked up on the object’s class, not in the object’s __dict__. http://docs.python.org/reference/datamodel#specialnames (Your test with class methods was a clever idea, but a class is a type instance, so it’s the same behavior: __enter__ is looked up on type, not on the class. Nice try :) Tip for future bug reports: We prefer regular files over archives. Thanks again! -- nosy: +merwok ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Changes by Éric Araujo mer...@netwok.org: -- resolution: - invalid stage: - committed/rejected status: open - closed type: - behavior ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Ariel Ben-Yehuda ariel@gmail.com added the comment: Bug or not bug, Python2.7 breaks Gobject-Introspection. -- status: closed - open ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Éric Araujo mer...@netwok.org added the comment: Please produce a test to prove that Python behaves in contradiction to the documentation. Otherwise I’m afraid it’s a GI bug, like in your tests :) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Ariel Ben-Yehuda ariel@gmail.com added the comment: My test on Class Methods was based on the GI Code that does not run on Python 2.7. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Éric Araujo mer...@netwok.org added the comment: I am afraid we have conflicting viewpoints. You are saying that upgrading Python broke code, and I agree it’s a bad thing. Usually such regression reports are accepted and fixed. In this case however, the code was already broken in the previous version, it was only working because of a problem in the implementation. So from the viewpoint of GI users, it’s a regression, but from the viewpoint of Python the 2.7 behavior fixes a regression in 2.6. It is not supported to find magic methods (“__name__”) on instances. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Éric Araujo mer...@netwok.org added the comment: Since Benjamin Peterson, release manager for 2.7, confirmed that the change was intentional, I’m closing again. To solve the bug in GI, you need to define a metaclass with those __enter__ and __exit__ methods, then use it as metaclass for LibtoolImporter. Please send me private email if you want more details. -- status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Ariel Ben-Yehuda ariel@gmail.com added the comment: Done it for myself. However, I am not a GI Maintainer - you should talk with them and send them this patch. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9259] Python 2.7 breaks assigned __exit__s
Éric Araujo mer...@netwok.org added the comment: Since you know the project, the bug and the fix, I think you’re in a better position than me to talk with them. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9259 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
