Now that there is a package mechanism (are package mechanisms?) like zipimporter that bundle source code into a single file, should the notion of a "file" location should be adjusted to include the package and/or importer?
Is there a standard API or routine which can extract this information given a code object? A use case here I am thinking of here is in a stack trace or a debugger, or a tool which wants to show in great detail information from a code object possibly via a frame. For example does this come from a zipped egg? And if so, which one? For concreteness, here is what I did and here's what I saw. Select one of the zipimporter eggs at http://code.google.com/p/pytracer and install one of these. I did this on GNU/Linux and Python 2.5 and I look at the co_filename of one of the methods: >>> import tracer >>> tracer.__dict__['size'].func_code.co_filename 'build/bdist.linux-i686/egg/tracer.py' But there is no file called "build/bdist.linux-686/egg/tracer.py" in the filesystem. Instead there is a member "tracer.py" inside /usr/lib/python2.5/site-packages/tracer-0.1.0-py2.5.egg'. It's possible I caused this egg to get built incorrectly or that setuptools has a bug which entered that misleading information. However, shouldn't there be a standard way to untangle package location, loader and member inside the package? As best as I can tell, PEP 302 which discussed importer hooks and suggests a standard way to get file data. But it doesn't address a standard way to get container package and/or loader information. Also I'm not sure there *is* a standard print string way to show member inside a package. zipimporter may insert co_filename strings like: /usr/lib/python2.5/site-packages/tracer-0.1.0-py2.5.egg/tracer.py but the trouble with this is that it means file routines have to scan the path and notice say that /usr/lib/python2.5/site-packages/tracer-0.1.0-py2.5.egg is a *file*, not a directory. And a file stat/reading routine needs to understand what kind of packager that is in order to get tracer.py information. (Are there any file routines in place for doing this?) Thanks. _______________________________________________ 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
