Updated CNDA to support the new C API in Python 3.

theano/sandbox/cuda/cuda_ndarray.cuh

 #ifndef _CUDA_NDARRAY_H
 #define _CUDA_NDARRAY_H
 
+// Defines for Python 2/3 compatibility.
+#if PY_MAJOR_VERSION == 3
+// Py3k treats all ints as longs.
+#define PyInt_Check PyLong_Check
+#define PyInt_CheckExact PyLong_CheckExact
+#define PyInt_AsLong PyLong_AsLong
+#define PyInt_FromLong PyLong_FromLong
+#define PyNumber_Int PyNumber_Long
+
+// Py3k strings are unicode, these mimic old functionality.
+#define PyString_Check PyUnicode_Check
+#define PyString_FromString PyUnicode_FromString
+#define PyString_AsString PyUnicode_AsUTF8
+#define PyString_FromStringAndSize PyUnicode_FromStringAndSize
+#define PyString_Size PyUnicode_GET_SIZE
+
+#define PyCObject_AsVoidPtr NpyCapsule_AsVoidPtr
+#define PyCObject_GetDesc NpyCapsule_GetDesc
+#define PyCObject_Check NpyCapsule_Check
+
+// Python 3 expects a PyObject* as the first argument to PySlice_GetIndicesEx().
+#define SLICE_CAST(x) (x)
+#else
+// Python 2 expects a PySliceObject* as the first argument to PySlice_GetIndicesEx().
+#define SLICE_CAST(x) ((PySliceObject*)(x))
+#endif
+
 #include <numpy/arrayobject.h>
 #include <stdio.h>