为啥会出错，TypeError: Restaurant() takes no arguments

class Restaurant():

def _init_(self, restaurant_name, cuisine_type):
    self.restaurant_name = restaurant_name
    self.cuisine_type = cuisine_type

def describe_restaurant(self):
    print(self.restaurant)
    print(self.cuisine_type)
def open_restaurant(self):
    print("餐馆正在营业")

restaurant = Restaurant("haoyunlai", "hot pot")

restaurant.describe_restaurant()
restaurant.open_restaurant()

init_前后都是两个下划线__init_
多让编译器自动生成函数名，少手敲

init 这个是双下划线么？