set

>>> dir(set)
['__and__', '__class__', '__class_getitem__', '__contains__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__iand__', '__init__', '__init_subclass__', '__ior__', '__isub__', '__iter__', '__ixor__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__or__', '__rand__', '__reduce__', '__reduce_ex__', '__repr__', '__ror__', '__rsub__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__xor__', 'add', 'clear', 'copy', 'difference', 'difference_update', 'discard', 'intersection', 'intersection_update', 'isdisjoint', 'issubset', 'issuperset', 'pop', 'remove', 'symmetric_difference', 'symmetric_difference_update', 'union', 'update']

Dunder methods

Dunder Method	Operation	Example (normal syntax)	Example (dunder call)
__contains__	Membership	2 in {1,2,3}	{1,2,3}.__contains__(2)
__len__	Length	len({1,2,3})	{1,2,3}.__len__()
__iter__	Iteration	for x in {1,2,3}	{1,2,3}.__iter__()
__and__	Intersection	{1,2,3} & {2,3,4} → {2,3}	{1,2,3}.__and__({2,3,4})
__or__	Union	{1,2} | {2,3}→{1,2,3}	{1,2}.__or__({2,3})
__sub__	Difference	{1,2,3} - {2} → {1,3}	{1,2,3}.__sub__({2})
__xor__	Symmetric difference	{1,2,3} ^ {2,4} → {1,3,4}	{1,2,3}.__xor__({2,4})
__eq__	Equality	{1,2} == {2,1}	{1,2}.__eq__({2,1})