In Python,

The following code is used to create a new kind of list that keeps track of the number of unique elements in the list. class strange_list: def __init__(self) self-data- def add(self, item): if item not in self._data: self-data += [item] if item in self._data: self._count 1 def remove(self, item) self._count1 self._data.remove(item def uniques (self def is_empty(self) def size(self): def str__(self): return self._count return len(self._data0 return len(self._data) return str(self._data This list has the following functions: strange list) - creates a new empty list add adds an element to the list remove -removes an element from the list uniques -returns the number of unique elements in the list (note that x and y are unique if xy is False) is_empty returns True if the list is empty and False otherwise . . size--returns the number of elements in the list The contents of the list can also be displayed as a string using stro) For example, you could use the list as follows s strange listO s.addC'hello") s.add('world') print(s.sizeO) print(s.uniques) print(s) However, the list does not always work correctly. In some cases, the code will not produce the correct result. Submit a docstring that contains a doctest comment demonstrating the flaw in the code Important: Make sure there are no spaces or indentation before the docstring begins