Fetch an output from the designated stack.

        Args:
            value (str): string with the following format:
                <stack_name>::<output_name>, ie. some-stack::SomeOutput
            context (:class:`stacker.context.Context`): stacker context

        Returns:
            str: output from the specified stack

def handle(cls, value, context=None, **kwargs):
        """Fetch an output from the designated stack.

        Args:
            value (str): string with the following format:
                <stack_name>::<output_name>, ie. some-stack::SomeOutput
            context (:class:`stacker.context.Context`): stacker context

        Returns:
            str: output from the specified stack

        """

        if context is None:
            raise ValueError('Context is required')

        d = deconstruct(value)
        stack = context.get_stack(d.stack_name)
        return stack.outputs[d.output_name]