% python
>>> from fastset import Set
>>> users1 = Set(['Bob', 'Emily', 'Howard'])
>>> users2 = Set(['Jerry', 'Howard', 'Carol'])
>>> allow = {'read': users1 | users2,  'write': users1 & users2}
>>> print allow['read']
<Set:['Jerry', 'Carol', 'Howard', 'Emily', 'Bob']>
>>> print allow['write']
<Set:['Howard']>
>>> users1 | Set(['Bob', 'Bob', 'Bob'])
<Set:['Howard', 'Emily', 'Bob']>
>>> users1 & Set(['Bob', 'Bob', 'Bob'])
<Set:['Bob']>
>>> users1.concat(['Bob', 'Bob', 'Bob'])
>>> users1
<Set:['Howard', 'Emily', 'Bob']>
>>> users1.data
{'Howard': None, 'Emily': None, 'Bob': None}