Set operators

Ops 		P	⨯	 \	 =	 ≠
Front 		⊂	⊄	⊆	⊈	⊊ 
Back 		⊃	⊅	⊇	⊉	⊋
Inside 		∀	∃	∊	∍
Objects 	∅	∞	∆	∇

Set operators

>>> a = {1, 2, 3, 4, 5, 6}
>>> b = {4, 5, 6, 7, 8, 9}
>>>
>>> a.update(b)          # a "union" operation
>>> a
{1, 2, 3, 4, 5, 6, 7, 8, 9}
>>>
>>> a &= b               # the "intersection" operation
>>> a
{4, 5, 6, 7, 8, 9}
>>>
>>> a -= set((7, 8, 9))  # the "difference" operation
>>> a
{4, 5, 6}
>>>
>>> a ^= b               # the "symmetric difference" operation
>>> a
{7, 8, 9}

Source: freecodecamp.org

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