human
Here's a good function header given the following:
I wrote the below code

    name = ctypes.c_char_p()
    desc = ctypes.c_char_p()
    num_args = mx_uint()
    arg_names = ctypes.POINTER(ctypes.c_char_p)()
    arg_types = ctypes.POINTER(ctypes.c_char_p)()
    arg_descs = ctypes.POINTER(ctypes.c_char_p)()
    check_call(_LIB.MXDataIterGetIterInfo(handle, ctypes.byref(name), ctypes.byref(desc), ctypes.byref(num_args), ctypes.byref(arg_names), ctypes.byref(arg_types), ctypes.byref(arg_descs)))
    iter_name = py_str(name.value)
    narg = int(num_args.value)
    param_str = _build_param_doc([py_str(arg_names[i]) for i in range(narg)], [py_str(arg_types[i]) for i in range(narg)], [py_str(arg_descs[i]) for i in range(narg)])
    doc_str = ((((('%s\n\n' + '%s\n') + 'Returns\n') + '-------\n') + 'MXDataIter\n') + '                The    result    iterator.')
    doc_str = (doc_str % (desc.value, param_str))
    def creator(*args, **kwargs):
        'Create    an    iterator.\n                                The    parameters    listed    below    can    be    passed    in    as    keyword    arguments.\n\n                                Parameters\n                                ----------\n                                name    :    string,    required.\n                                                Name    of    the    resulting    data    iterator.\n\n                                Returns\n                                -------\n                                dataiter:    Dataiter\n                                                The    resulting    data    iterator.\n                                '
        param_keys = []
        param_vals = []
        for (k, val) in kwargs.items():
            param_keys.append(c_str(k))
            param_vals.append(c_str(str(val)))
        param_keys = c_array(ctypes.c_char_p, param_keys)
        param_vals = c_array(ctypes.c_char_p, param_vals)
        iter_handle = DataIterHandle()
        check_call(_LIB.MXDataIterCreateIter(handle, mx_uint(len(param_keys)), param_keys, param_vals, ctypes.byref(iter_handle)))
        if len(args):
  ...

What's a good function header?
assistant
#Here's a good function header.

def _make_io_iterator(handle):