text: from numbers import Number
  from Timer import Timer
  
  class ActivityEvent(): 
      units=[]
      types=[]
  
      def __init__(self, types, units): 
          self.units = units
          self.types = types
          self.type = ""
          self.timer = Timer()
  
      @property
      def type(self):
          return self.__type
  
      @type.setter
      def type(self, value):
          if value in self.types:
              self.__type = value
          else:
              raise ValueError("Type is not correct, use " +str(types))
      
      @property 
      def distance(self): 
          return self.__distance 
      
      @distance.setter 
      def distance(self, value): 
          if not isinstance(value, Number):
              raise ValueError("Value is not correct, give positive number")
          elif value < 0: 
              raise ValueError("Value is not correct, give positive number")
          else:
              self.__distance = value
  
      @property
      def unit(self):
          return self.__unit
  
      @unit.setter
      def unit(self, unit):
          if unit in self.units:
              self.__unit = unit
          else:
              raise ValueError("Unit is not correct, use "+str(units))
      
      @property 
      def timer(self):
          return self.__timer
  
      @timer.setter
      def timer(self, timer):
          self.__timer = timer
  