code: def target_opacity(self, value):
          
  
          if value is not None:
              assert type(value) is float, "'{0}' attribute: '{1}' type is not 'float'!".format("target_opacity", value)
              assert value >= 0, "'{0}' attribute: '{1}' need to be positive!".format("target_opacity", value)
              assert value <= 1, "'{0}' attribute: '{1}' need to be less or equal than '1'!".format(
                  "target_opacity", value)
          self.__target_opacity = value
docs: Setter for **self.__target_opacity** attribute.
  
          :param value: Attribute value.
          :type value: float