Core Python Programming (2nd Edition)

!= Is not equal to
< Is a (strict) subset of
Is a (strict) superset of
>= Is a superset of (includes improper supersets)
& Intersection
| Union
- or \ - Difference or relative complement
Δ ^ Symmetric difference
How to Create and Assign Set Types
There is no special syntax for sets like there is for lists ( [ ] ) and dictionaries ( { } ) for example. Lists
and dictionaries can also be created with their corresponding factory functions list() and dict(), and
that is also the only way sets can be created, using their factory functions set() and frozenset():
>>> s = set('cheeseshop')
>>> s
set(['c', 'e', 'h', 'o', 'p', 's'])
>>> t = frozenset('bookshop')
>>> t
frozenset(['b', 'h', 'k', 'o', 'p', 's'])
>>> type(s)
>>> type(t)
>>> len(s)
6
>>> len(s) == len(t)
True
>>> s == t
False
How to Access Values in Sets
You are either going to iterate through set members or check if an item is a member (or not) of a set:
>>> 'k' in s
False
>>> 'k' in t
True
>>> 'c' not in t
True
>>> for i in s: