Three dots in Python

from abc import abstractmethod

class A:
    def __init__(self):
        self.name = "A"
        print("Init")

    def three_dots(self): ...

    @abstractmethod
    def abs_three_dots(self): ...

    def raise_it(self):
        raise Exception("Not yet done")



a = A()

print("\nthree_dots")
print(a.three_dots())

print("\nabs_three_dots")
print(a.abs_three_dots())

print("\nraise_it")
a.raise_it()