text: from abc import ABC, abstractmethod
  from tinkerforge_variable import Tinkerforge_Variable
  
  class IV(Tinkerforge_Variable):
  
      def __init__(self, *args, **kwargs):
          self._name = "IV"
          self._variable_label = "Independent Variable"
  
          super(IV, self).__init__(*args, **kwargs)
  
      # Method for measuring dependent variable.
      @abstractmethod
      def manipulate(self):
          pass
  
      # Method for cleaning up measurement device.
      @abstractmethod
      def __clean_up__(self):
          pass
  