En Tue, 12 Aug 2008 19:48:54 -0300, Cromulent
<[EMAIL PROTECTED]> escribi�:
On 2008-08-12 05:37:53 +0100, "Gabriel Genellina"
<[EMAIL PROTECTED]> said:
En Mon, 11 Aug 2008 12:58:00 -0300, Cromulent
<[EMAIL PROTECTED]> escribi�:
<snip>
Uh? You have a complete API for working with list objects, the
functions named PyList_*
See http://docs.python.org/api/listObjects.html
There is also an abstract layer that works both with lists and tuples:
http://docs.python.org/api/sequence.html
If that's not what you are after, please provide more details...
Spoke too soon.
Right, I've rewritten the Python program and it returns a tuple of lists
and one integer. Basically as you saw before, the python program reads a
file in, splits it into elements that were separated by a comma.
The new program just puts each element into its own list. Here is a line
from the file I am reading in:
15-Jul-08,37.70,37.70,36.43,36.88,102600
so basically I have 6 lists and one int (which is the total number of
lines read by the program) I then return that tuple to the C program.
You don't need the integer - it's the list length, and you can easily ask
that value using PyList_Size.
So you are now returning *columns* from the file, ok?
After that I call the following:
error = PyArg_ParseTuple(value, "isffffi", &totalLines, &finopen,
&finclose, &finhigh, &finlow, &finvolume);
but that will only give me the first element of the list. What I would
like to do is return the total number of lines read separately, then use
that to allocate a C99 style variable sized array and then loop through
the call to PyArg_ParseTuple to populate the array. The problem with
that is that I don't think PyArg_ParseTuple is designed in that way. It
will put the contents of the list in the variable and not split it up so
that I can populate an array.
Yes, forget about PyArg_ParseTuple. It's intended to parse function
arguments. Use the appropiate convert function for each object type. For
integers, use PyInt_AsLong; for floats, PyFloat_AsDouble, and so on.
Something like this (untested):
// for a column containing float values:
Py_ssize_t nitems = PyList_Size(the_python_list_of_floats)
// ...allocate the C array...
for (Py_ssize_t i=0; i<nitems; i++) {
PyObject* item = PyList_GetItem(the_python_list_of_floats, i);
your_c_array_of_double[i] = PyFloat_AsDouble(item);
}
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
