C API (embedded Python): How to get and set named variables

[mrabens]

From the C API (I'm using Python embedded), how can I get and set the
value of named variables? Right now, I'm using hacks like
PyRun_SimpleString("foobar = 12\n"), but I'd really like to access the
named objects directly.

 

[Farshid Lashkari]

value of named variables? Right now, I'm using hacks like
PyRun_SimpleString("foobar = 12\n"), but I'd really like to access the
named objects directly.

You can use the following C functions to set/get named attributes of an
object:

PyObject_SetAttrString
PyObject_GetAttrString

If the attributes belong to the global scope of a module, then you can
use "PyImport_AddModule" to get a handle to the module object. For
example, if you wanted to get the value of an integer in the __main__
module named "foobar", you would do the following:

PyObject *m = PyImport_AddModule("__main__");
PyObject *v = PyObject_GetAttrString(m,"foobar");

int foobar = PyInt_AsLong(v);

Py_DECREF(v);

You will probably want to add some error checking in your code.

-Farshid

 

[Martoon]

Thank you! Just what I needed.

I came across the PyObject_*AttrString() functions earlier when
searching through the docs, and I thought I was in the right area, but
I didn't know what object I was supposed to set the attribute for.
Now I see that it's a module object. It all makes sense now. Thanks!