运行python 时出现TypeError: obj() takes no parametrs

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运行以下代码时出现TypeError: obj() takes no parametrs

root cause: init前后各有两个下划线"_", 但代码中只写了一个

class Dog():

    def _init_(self,name,age):
       self.name=name
       self.age=age

   def sit(self):
       print(self.name.title()+" is now siting.")

   def roll_over(self):
       print(self.name.title()+" rolled over!")

my_dog=Dog('haha',6)
print("my dog's name is "+my_dog.name.title()+".")
print("my dog is "+str(my_dog.age)+" years old")
my_dog.sit()
my_dog.roll_over()

正确代码应该是：

class Dog():
   """一次模拟小狗的简单测试"""
   def __init__(self,name,age):
       """初始化属性name and age"""
       self.name=name
       self.age=age

   def sit(self):
       """模拟小狗听到命令时蹲下"""
       print(self.name.title()+" is now siting.")

   def roll_over(self):
       """模拟小狗听到命令时打滚"""
       print(self.name.title()+" rolled over!")

my_dog=Dog('haha',6)
print("my dog's name is "+my_dog.name.title()+".")
print("my dog is "+str(my_dog.age)+" years old")
my_dog.sit()
my_dog.roll_over()

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