How to use the asteval.astutils.op2func function in asteval

def on_boolop(self, node):    # ('op', 'values')
        """Boolean operator."""
        val = self.run(node.values[0])
        is_and = ast.And == node.op.__class__
        if (is_and and val) or (not is_and and not val):
            for n in node.values[1:]:
                val = op2func(node.op)(val, self.run(n))
                if (is_and and not val) or (not is_and and val):
                    break
        return val

def on_binop(self, node):    # ('left', 'op', 'right')
        """Binary operator."""
        return op2func(node.op)(self.run(node.left),
                                self.run(node.right))

def on_unaryop(self, node):    # ('op', 'operand')
        """Unary operator."""
        return op2func(node.op)(self.run(node.operand))

def on_compare(self, node):  # ('left', 'ops', 'comparators')
        """comparison operators, including chained comparisons (a