At 01:33 PM 11/9/2005 -0800, Grig Gheorghiu wrote:
>I'm working on a project I called "Cheesecake" which aims to quantify
>the "goodness" of Python packages based on various indicators such as
>presence of special files (README, LICENSE, etc.), special directories
>(tests, doc, etc.), percentage of modules/classes/methods/functions
>with docstrings, etc.
>
>It would be nice if there was a standardized way to get to a download
>URL for a given package listed at the Cheeseshop.
setuptools' "package_index" module has facilities to scan Cheeseshop pages
and the pages they link to for URLs that are downloadable
distributions. Also, the "easy_install" command-line tool can be used to
fetch and extract editable source (or check out from subversion) the source
code of a project. For example:
$ easy_install -eb~/projects SQLObject
Searching for SQLObject
Reading http://www.python.org/pypi/SQLObject/
Reading http://sqlobject.org
Best match: SQLObject 0.7.0
Downloading
http://cheeseshop.python.org/packages/source/S/SQLObject/SQLObject-0.7.0.tar.gz#md5=dccb921b5df6a15312b56630ac4ac205
Processing SQLObject-0.7.0.tar.gz
Extracted editable version of SQLObject to ~/projects/sqlobject
Notice that this works even with projects not hosted at the Cheeseshop,
even if they are on Sourceforge mirrors:
$ easy_install -eb~/projects ctypes
Searching for ctypes
Reading http://www.python.org/pypi/ctypes/
Reading http://starship.python.net/crew/theller/ctypes/
Reading http://sourceforge.net/project/showfiles.php?group_id=71702
Best match: ctypes 0.9.6
Downloading
http://prdownloads.sourceforge.net/ctypes/ctypes-0.9.6.zip?download
Requesting redirect to (randomly selected) 'surfnet' mirror
Downloading
http://surfnet.dl.sourceforge.net/sourceforge/ctypes/ctypes-0.9.6.zip
Processing ctypes-0.9.6.zip
Extracted editable version of ctypes to ~/projects/ctypes
As long as a download link is available from one of these three places, it
can be found:
1. The cheeseshop page for the package
2. The page referenced by the cheeseshop "download url" link
3. The page referenced by the cheeseshop "home page" link
I would say that any project whose download URL(s) can't be found by
easy_install should get a bad score on your metrics, since it's going to be
pretty tough for the *user* to find the package!
EasyInstall is not limited to source downloads, however. It's just that
the '-e' option tells it you want an "editable" distribution (e.g., a
Subversion checkout preferably, with a source distribution being second
best), and the '-b' option tells it the base directory under which the
project directory should be created. (Ordinarily, EasyInstall just
attempts to get binaries or build and install them.)
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