I'm trying to write an extension module in C which contains a single function with the following prototype:
void func( int N, int * arg1, int * arg2, int * ret ); Here arg1 and arg2 are length N arrays, and the function computes ret which is also an N length array. From python I'd like to call this function as ret = func( [ 1, 2, 3 ], [ 2, 3, 4] ) I've read through the docs at http://docs.python.org/extending/extending.html and also http://docs.python.org/c-api/arg.html from which I learned how to pass a fixed number of basic datatypes (int, float, string) from python to C and back. What I don't know is how to pass an array back and forth. As far as I can see PyArg_ParseTuple is the function I should use for converting the python arguments to C but the format string passed to PyArg_ParseTuple can only be one of the basic data types ("s", "i", etc) or a generic python object ("O"). Does this mean that I can only pass the arrays from python to C as generic python objects and in a later operation I need to get the elements from this generic python object, construct a C array and pass that to the C function? Since I assume this is a frequent operation I'd think there are some shortcuts, aren't there? Or what's the simplest way of doing this? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
