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Sets

A set is an unordered collection of unique immutable objects (yet the set itself is mutable). A set can be defined using curly braces, with objects separated by commas:

s = {1, 2, 3, 2} # duplicity in sets is ignored
print(s)
# Example: set operations
a = set([1, 2, 3]) # make a set from a list
b = set((2, 3, 4)) # make a set from a tuple
print(a | b) # union
print(a & b) # intersection
print(a - b) # set-difference
print(a.isdisjoint(b), a.issubset(b), a.issuperset(b))
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