Expert Python Programming - Third Edition

Calling and binding conventions

As explained in the A closer look at Python/C API section, the ml_flags bit field of the PyMethodDef structure contains flags for calling and binding conventions. Calling convention flags are as follows:

• METH_VARARGS: This is a typical convention for the Python function or method that accepts only arguments as its parameters. The type provided as the ml_meth field for such a function should be PyCFunction. The function will be provided with two arguments of the PyObject* type. The first is either the self object (for methods) or the module object (for module functions). A typical signature for the C function with that calling convention is PyObject* function(PyObject* self, PyObject* args).
• METH_KEYWORDS