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set() ⚬ᵖʸ|Documentation|1st|20251021010041-00-⌔

Built-in Types — Python 3 documentation#set

class set(iterable=(),/)

class frozenset(iterable=(),/)

Return a new set or frozenset object whose elements are taken from iterable. The elements of a set must be hashable. To represent sets of sets, the inner sets must be frozenset objects. If iterable is not specified, a new empty set is returned.

Sets can be created by several means:

  • Use a comma-separated list of elements within braces: {'jack', 'sjoerd'}
  • Use a set comprehension: {c for c in 'abracadabra' if c not in 'abc'}
  • Use the type constructor: set(), set('foobar'), set(['a', 'b', 'foo'])

Instances of set and frozenset provide the following operations:

Printed 2026-06-28.

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