代码如下：
class Dog():
def init(self, name, age):
self.name = name
self.age = age
def sit(self):
print(self.name.title() + "is now sitting.")
def roll_over(self):
print(self.name.title() + "rolled over!")

调用类

my_dog = Dog('willie' ,6)
my_dog.sit()

print("My dog's name is " + my_dog.self.name.title())

print("My dog is "+ str(my_dog.self.age)+ "years old!")

提示的错误如下：
TypeError Traceback (most recent call last)
<ipython-input-13-769d83419730> in <module>
----> 1 my_dog = Dog('willie' ,6)
2 my_dog.sit()
3 #print("My dog's name is " + my_dog.self.name.title())
4 #print("My dog is "+ str(my_dog.self.age)+ "years old!")

TypeError: object() takes no parameters