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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_slot(handler_input, slot_name):
 # type: (HandlerInput, str) -> Optional[Slot] """Return the slot information from intent request. The method retrieves the slot information :py:class:`ask_sdk_model.slot.Slot` from the input intent request for the given ``slot_name``. More information on the slots can be found here : https://developer.amazon.com/docs/custom-skills/request-types-reference.html#slot-object If there is no such slot, then a ``None`` is returned. If the input request is not an :py:class:`ask_sdk_model.intent_request.IntentRequest`, a :py:class:`TypeError` is raised. :param handler_input: The handler input instance that is generally passed in the sdk's request and exception components :type handler_input: ask_sdk_core.handler_input.HandlerInput :param slot_name: Name of the slot that needs to be retrieved :type slot_name: str :return: Slot information for the provided slot name if it exists, or a `None` value :rtype: Optional[ask_sdk_model.slot.Slot] :raises: TypeError if the input is not an IntentRequest """

    request = handler_input.request_envelope.request
    if isinstance(request, IntentRequest):
        if request.intent.slots is not None:
            return request.intent.slots.get(slot_name, None)
        else:
            return None

    raise TypeError("The provided request is not an IntentRequest")