On 2007-01-03 00:35, Barry Warsaw wrote: > On Jan 2, 2007, at 5:41 PM, M.-A. Lemburg wrote: > >> Note that as side-effect of this it becomes a lot harder to manipulate >> PYTHONPATH to trick Python into loading a standard module from a >> non-standard location, improving security and robustness of the >> Python installations. > > Sometimes though you want to do this, as when you want your application > to ensure it gets a particular version of a standard library module, > regardless of the version of Python being used. And now we're back to > application-specific site-packages ;).
Well, I guess that's a rather particular use case and can probably only be safely implemented by the maintainer of the module or package in question ;-) In such (rare) cases, it should be possible to use one of the harder ways to achieve this: * monkey patching the package * using package.__path__ to redirect the in-package search * creating a private copy of the whole package which then has the modified modules and packages in place Regarding application specific package setups: In my experience it's better to have an application specific sys.path setup function that manages this, rather than trying to manipulate PYTHONPATH or trying to tweak Python's stdlib site.py into using some particular way of setting up application specific paths which then makes interop harder for all applications using Python, rather than just the few that require such setups. The application can then call this path setup function early on in the startup phase to make sure that the rest of the startup and the application's main code then imports the right modules and packages. -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Source (#1, Jan 03 2007) >>> Python/Zope Consulting and Support ... http://www.egenix.com/ >>> mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/ >>> mxODBC, mxDateTime, mxTextTools ... http://python.egenix.com/ ________________________________________________________________________ ::: Try mxODBC.Zope.DA for Windows,Linux,Solaris,FreeBSD for free ! :::: _______________________________________________ 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
