Question

5.2. Set

>>> set = {'a','b','c'}
>>> set
set(['a', 'c', 'b'])

>>> set = {"one", "two", "three","one"}
>>> set
set(['three', 'two', 'one'])		

>>> set.add('four')
>>> set
set(['four', 'three', 'two', 'one'])

>>> ','.join(set);
'four,three,two,one'

>>> set('four,three,two,one'.split(','));
{'one', 'four', 'three', 'two'}

>>> fruit = [ 'banana', 'orange', 'pineapple' ]
>>> set(fruit)
{'banana', 'pineapple', 'orange'}