Implementing intersection operator for a set-like class in Python -

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i'm trying implement wrapper class should ideally allow me intersection of elements using notation:

a & b

is there specific method can implement achieve this? (i know individual elements need implement __hash__ , __eq__ methods)

i'm getting following error:

typeerror: unsupported operand type(s) &: 'proparray' , 'proparray'

try override:

def __and__(self, *args, **kwargs): # real signature unknown     """ return self&value. """     pass

in class


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