Quoting [Ole Christian Weidner] (Nov 04 2009):
Hi,
slightly off-topic, but where can I actually download VU's Python bindings?
According to Mathijs, from a different mail (which you should have seen):
The easiest is to checkout the whole PySaga repository, which contains the language bindings (in /spec/trunk), the implementation on top of Java (in /impl/jysaga/trunk) and the python-cpp wrapper (in /impl/cppysaga/trunk). The svn url is:
https://gforge.cs.vu.nl/svn/pysaga
You have read-only access with user 'anonymous' and an empty password. Manuel (cc'd) knows all the details of the python-cpp wrapper code.
Cheers, Andre.
Cheers, Ole
On Nov 4, 2009, at 9:48 AM, Mathijs den Burger wrote:
Hi all,
For the Python language bindings, we (at the VU) are thinking about CCT's idea to use the Python 'dict' interface for SAGA attributes. While we like the idea to use Python-specific constructs in the language bindings, it seems that SAGA attributes differ in semantics from the 'associative arrays' that are Python's dictionaries.
Some examples where Python dicts and SAGA attributes differ:
1. They throw different exceptions (e.g. KeyError vs BadParameter / PermissionDenied / DoesNotExist / AuthenticationFailed / AuthorizationFailed / BadParameter / IncorrectState / NoSuccess)
2. Removing SAGA attributes is permanent (AFAIK when talking to Ceriel), while a deleted dict item can be re-added latter
3. Dictionaries accept any hashable object, whereas SAGA attributes only accept a set of defined values.
Exposing SAGA attributes as a dictionary may therefore lead to confusion, as the two are similar but not identical.
Another option for easy access (which we use in our implementation on top of Java SAGA) is to use Python's 'property' construct for each defined attribute. This allows you to do, for example:
from saga import job js = job.JobDescription() js.Executable = "/bin/date" js.Arguments = [ "-R" ]
Python translates such property access to calling getter an setter functions that can do additional checking. Very flexible, and the syntax is even shorter than using the 'dict' interface. Wouldn't that be a better option for easy access to SAGA attributes in Python?
best, Mathijs
-- saga-rg mailing list saga-rg@ogf.org http://www.ogf.org/mailman/listinfo/saga-rg -- Nothing is ever easy.