How can I overload the unary negative (minus) operator in Python?

It sounds like you want the unary minus operator on to Card

return a new map with a negative value. If you need it, you can define the operator __neg__

in your class like this:

class Card:
    def __init__(self, val):
        self.val = val
    def __neg__(self):
        return Card(-self.val)

      

        
        
        
      

    

__neg__

included in the list of methods that can be overridden to customize arithmetic operations here: https://docs.python.org/3/reference/datamodel.html#emulating-numeric-types