我用书上的办法编完程序，就报错了

Question

用书上的办法编完程序，为啥就一直报错啊？

class Dog():
    """模拟小狗"""
    def _init_(self,name,age):
        """初始化属性"""
        self.name= name
        self.age= age
    def sit(self):
        """小狗收到命令蹲下"""
        print(f"{self.name} is sitting......")
    def roll_over(self):
        """模拟小狗打滚"""
        print(f"{self.name} rolled over!")
my_dog=Dog(111,1)
print(f"My dog's name is {my_dog.name}")
print(f"My dog is {my_dog.age} years old")

Answer 1

def __init__(self,name,age):  init两边各两个_