code: def sense(self):
          
          self.current_situation = bitstrings.BitString([
              random.randrange(2)
              for _ in range(self.address_size + (1 << self.address_size))
          ])
          return self.current_situation
docs: Return a situation, encoded as a bit string, which represents
          the observable state of the environment.
  
          Usage:
              situation = scenario.sense()
              assert isinstance(situation, BitString)
  
          Arguments: None
          Return:
              The current situation.