On Fri, Jul 30, 2010 at 1:26 PM, Barry Warsaw <ba...@python.org> wrote: > In working on making Python 2.7 available in Debian and Ubuntu, we ran into > two packages that fail to byte compile against Python 2.7, where they are fine > in Python 2.6. The Debian bug tracker issues are: > > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=590821 > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=590822 > > Specifically, what fails now is assignment to the __debug__ attribute of a > module, e.g. sys -- *not* builtin __debug__. > > % python2.6 > Python 2.6.5 (r265:79063, Apr 16 2010, 13:57:41) > [GCC 4.4.3] on linux2 > Type "help", "copyright", "credits" or "license" for more information. >>>> __debug__ = 1 > File "<stdin>", line 1 > SyntaxError: can not assign to __debug__ >>>> import sys >>>> sys.__debug__ = 1 >>>> > % python2.7 > Python 2.7.0+ (release27-maint:83294, Jul 30 2010, 15:49:51) > [GCC 4.4.3] on linux2 > Type "help", "copyright", "credits" or "license" for more information. >>>> __debug__ = 1 > File "<stdin>", line 1 > SyntaxError: cannot assign to __debug__ >>>> import sys >>>> sys.__debug__ = 1 > File "<stdin>", line 1 > SyntaxError: cannot assign to __debug__ >>>> > > I think it's actually somewhat questionable that this is now illegal. It > certainly breaks at least two packages. More disturbing though is that I > cannot find mention of this change in Misc/NEWS or in the tracker, so I don't > actually know if this was intentional or not.
Well it is a reserved name so those packages that were setting it should have known that they were using undefined behavior that could change at any time. > It looks like Benjamin's change in r67171 was the relevant diff. > > Thoughts? Either way I will file a bug. IOW, if this change should *not* > have been made, I think it should be reverted for Python 2.7.1 and I can patch > our version of Python in the meantime. If this change is intentional, I'll > file a bug against (or just fix) Misc/NEWS and the What's New. -- --Guido van Rossum (python.org/~guido) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
