[Python] Is it possible to overload Python assignment?

Is there a magic method that can overload the assignment operator, like __assign__(self, new_value)?

I'd like to forbid a re-bind for an instance:

class Protect():
def __assign__(self, value):
raise Exception("This is an ex-parrot")

var = Protect() # once assigned...
var = 1 # this should raise Exception()


Is it possible? Is it insane? Should I be on medicine?

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