On Jul 27, 2010, at 12:33 AM, Jakub Wilk wrote: >In sid there are two packages with python2.7-specific bytecompilation >errors: mgltools-viewerframework and python-jaxml. Both packages do >something like: > >import sys >sys.__debug__ = something > >which is a syntax error in Python 2.7. This one's really interesting. % 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__ >>> So assignment to global __debug__ has been a SyntaxError since 2.6 (at least), but it now appears that the parser is more strict. It's not that __debug__ is a reserved word though because assignment to e.g. sys.print gives you a different SyntaxError. I don't see a specific item describing this in the Python 2.7 Misc/NEWS file, nor can I find a bug in the tracker for this issue, so I'm not sure if it's intended behavior or not. I think I'll raise this on python-dev before working on a patch for Debian. -Barry
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