> > Just as sys.path currently has default directory names, default
> > zip archive names are added too. Otherwise there is no way to
> > import all Python library files from an archive.
>
> A standard for this would be really cool.
Yup.
> > Suppose import.c generates the path
> > "/A/B/SubDir/Q/R/modfoo.pyc". Then it will also generate the path
> > "/C/D/E/Archive.zip/Q/R/modfoo.pyc". Finding the SubDir path is
> > exactly equivalent to finding "Q/R/modfoo.pyc" in the archive.
>
> So python packages and modules can exists *only* at the top level? That
> would conflict somewhat with jython where at would be common to put
> python modules into the same .zip file as java classes and java classes
> also wants to own the root of a zip file.
>
> In the current implementaion in jython, we can put python modules under
> any path and add the zipfile!path to sys.path:
>
> sys.path.append("/path/to/zipfile.zip!Lib")
>
> which will look for Lib/Q/R/modfoo.py (and Lib/Q/R/modfoo$py.class) in
> the archive.
Maybe it's possible to allow "/path/to/zipfile.zip/subdirectory/etc/"
in sys.path? That sounds better than picking a random new character
as delimiter.
> [I found efficiency hard to achieve in jython because opening a zipfile
> in java also cause the zip index to be read into a dictionary. So we
> did not want to reopen a zipfile if it can be avoided. Instead we hide a
> reference to the opened file in sys.path so that when removing a zipfile
> name from sys.path, the file is eventually closed.]
I don't think Python has this problem, since we have control over the
zipfile reading code.
> Would entries in the static python dict be removed when a zipfile is
> removed from sys.path?
It can be arranged that they are removed at some later point
(e.g. when sys.path is next searched).
> What is the __path__ vrbl set to in a module imported from a zipfile?
> Can the module make changes to __path__ and will be changes to used when
> importing submodules?
>
> What value should __file__ have?
IMO these two questions are answered by the pathname semantics
that Jim proposes: __file__ = "/C/D/E/Archive.zip/Q/R/modfoo.pyc" and
__path__ = ["/C/D/E/Archive.zip/Q/R"].
--Guido van Rossum (home page: http://www.python.org/~guido/)
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