Table of Contents

• Overview

Overview

x in set
x not in set
set.isdisjoint(other)
set <= other           set.issubset(other)
set < other            set <= other and set != other
set >= other           set.issuperset(other)
set > other            set >= other and set != other
set | other | ...      set.union(*others)
set & other & ...      set.intersection(*others)
set - other - ...      set.difference(*others)
set ^ other            set.symmetric_difference(other)
                       (either the set or other but not both)
set.copy()             (a shallow copy of s)

# only for set, not frozenset
set |= other | ...     set.update(*others)
set &= other & ...     set.intersection_update(*others)
set -= other | ...     set.difference_update(*others)
set ^= other           set.symmetric_difference_update(other)
set.add(elem)
set.remove(elem)       (remove elem. KeyError if elem doesn't exist)
set.discard(elem)      (remove elem if it is present)
set.pop()              (remove and return an arbitrary elem. KeyError if empty)
clear()

non-operator versions of union(), intersection(), difference(), and symmetric_difference(), issubset(), and issuperset() methods will accept any iterable as an argument. In contrast, their operator based counterparts require their arguments to be sets.

set('abc') == frozenset('abc') returns True and so does set('abc') in set([frozenset('abc')]).