              return spot
  
      def _find_available_spot(self, vehicle):
          """Find an available spot where vehicle can fit, or return None"""
          # ...
  
      def _park_starting_at_spot(self, spot, vehicle):
          """Occupy starting at spot.spot_number to vehicle.spot_size."""
          # ...
  
 
</s> remove         # ...
 </s> add         pass </s> remove     def park_vehicle(self, vehicle):  # ...
    def remove_vehicle(self):  # ... </s> add  </s> remove     def notify_call_escalated(self, call):  # ...
    def notify_call_completed(self, call):  # ...
    def dispatch_queued_call_to_newly_freed_employee(self, call, employee):  # ... </s> add  </s> remove     def shuffle(self):  # ... </s> add  </s> remove         # ...
 </s> add         pass
        pass
              return spot
  
      def _find_available_spot(self, vehicle):
          """Find an available spot where vehicle can fit, or return None"""
        pass
  
      def _park_starting_at_spot(self, spot, vehicle):
          """Occupy starting at spot.spot_number to vehicle.spot_size."""
          # ...
  
keep keep keep keep replace keep keep keep keep keep
 Convert all .py files to be valid Python (#98) 
solutions/object_oriented_design/parking_lot/parking_lot.py