dd an instance variable _logicalSize to the Array class. This variable is initially 0, and will track the number of items currently available to users of the array. Then add the method size() to the...

dd an instance variable _logicalSize to the Array class. This variable is initially 0, and will track the number of items currently available to users of the array. Then add the method size() to the Array class. This method should return the array’s logical size. The method __len__ should still return the array’s capacity or physical size.