Python pattern matching of self-made classes

match.py

class C:
    __match_args__ = ("__match_self_prop__",)
    
    def __init__(self, x, y=42):
        self.x = x
        self.y = y
    
    @property
    def __match_self_prop__(self):
        return self
        
    def __str__(self):
        return f"C({self.x=}, {self.y=})"

s = C(17)
print("Hello world")

match s:
    case int(s):
        print("int")
    case str(s):
        print("string")
    case C(s) as c:
        print("C", c)