I'll jump in and answer you questions. On Feb 21, 2007, at 10:18 AM, Robert Miller wrote:
> David, > > I was wondering if you could help get me started here. I've been > reading the Python/C API, and I've been browsing both sides of a lot > of Pyrex: for argument's sake, let's say the Complex double matrices. > First, I'm wondering how they're cdef-ing classes that they're then > calling from Python. cdef has two uses. The first is to declare a class as an extension type (so it can contain cdef'd property and functions), and the second is to declare a property/function as a c type. Cdef'd extension types are accessible from python, just not their cdef'd properties/functions. > Also, what do .so files in site-packages have to > do with specific classes in the repository? > > ( > sage: > sage.matrix.matrix_complex_double_dense.Matrix_complex_double_dense?? > Type: type > Base Class: <type 'type'> > String Form: <type > 'sage.matrix.matrix_complex_double_dense.Matrix_complex_double_dense'> > Namespace: Interactive > File: > /Volumes/DATA/sage/local/lib/python2.5/site-packages/sage/matrix/ > matrix_complex_double_dense.so > ) Each .pyx file has an associated shared object library containing all the classes/methods/etc. needed. > > I have some questions also about reference counting, but let's > start here..... You shouldn't have to worry about it too much. Basically, if you malloc something manually, you have to worry about freeing it. If you call the C/Python API directly (which you probably won't need to do), you have to worry if the returned PyObject* is a borrowed or new copy. But otherwise pyrex will take care of it all for you. > > -- > Robert L. Miller > http://www.robertlmiller.com/ > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
