= {}
>>> type(s)
<class 'dict'>
>>> s = set()
>>> s
set()
>>> s.add("Friday")
>>> print(s.add("Saturday"))
None
>>> s
{'Saturday', 'Friday'}
>>> len(s)
2
>>> s.add("Friday")
>>> s
{'Saturday', 'Friday'}
>>> x = [1,2,3,4]
>>> 1 in x
True
>>> 5 in x
False
>>> "Friday" in s
True
>>> "Easter" in s
False
>>> s.add(5)
>>> s
{5, 'Saturday', 'Friday'}
>>> s.add([1,2,3])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
>>> hash(4.2)
461168601842739204
>>> s
{5, 'Saturday', 'Friday'}
>>> t = set([5, 4, "cows", "pigs])
  File "<stdin>", line 1
    t = set([5, 4, "cows", "pigs])
                                 ^
SyntaxError: EOL while scanning string literal
>>> t = set([5, 4, "cows", "pigs"])
>>> t
{'pigs', 'cows', 4, 5}
>>> t
{'pigs', 'cows', 4, 5}
>>> s
{5, 'Saturday', 'Friday'}
>>> t.isdisjoint(s)
False
>>> t.intersection(s)
{5}
>>> t.union(s)
{'cows', 4, 5, 'Saturday', 'Friday', 'pigs'}
>>> t.symmetric_difference(s)
{'cows', 4, 'Saturday', 'Friday', 'pigs'}
>>> s
{5, 'Saturday', 'Friday'}
>>> t
{'pigs', 'cows', 4, 5}
>>> t + s
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'set' and 'set'
>>> t or s
{'pigs', 'cows', 4, 5}
>>> s = set([2,3,4,5,6])
>>> t = set([2,4,6])
>>> s.issubset(t)
False
>>> t.issubset(s)
True
>>> s <= t
False
>>> t <= s
True
>>> s | t
{2, 3, 4, 5, 6}
>>> s.union(t)
{2, 3, 4, 5, 6}
>>> s ^ t
{3, 5}
>>> s.symmetric_difference(t)
{3, 5}
>>> s & t
{2, 4, 6}
>>> s.intersection(t)
{2, 4, 6}
>>> s.difference(t)
{3, 5}
>>> s
{2, 3, 4, 5, 6}
>>> t
{2, 4, 6}
>>> s - t
{3, 5}
>>> t - s
set()
>>> (s - t) | (t - s)
{3, 5}
>>> 10 not in s
True
>>> s = [3,45,6,32,4,56,75,32,8,4,8,2,9]
>>> s = set(s)
>>> s = list(s)
>>> s
[32, 2, 3, 4, 6, 8, 9, 75, 45, 56]
>>> tuple(set(s))
(32, 2, 3, 4, 6, 8, 9, 75, 45, 56)
>>>