'Replace unicode.split(...) by a direct call to the
corresponding C-API function.'

def _handle_simple_method_unicode_split(self, node, function, args, is_unbound_method):

    if (len(args) not in (1, 2, 3)):
        self._error_wrong_arg_count('unicode.split', node, args, '1-3')
        return node
    if (len(args) < 2):
        args.append(ExprNodes.NullNode(node.pos))
    self._inject_int_default_argument(node, args, 2, PyrexTypes.c_py_ssize_t_type, '-1')
    return self._substitute_method_call(node, function, 'PyUnicode_Split', self.PyUnicode_Split_func_type, 'split', is_unbound_method, args)
