import sys # 首先导入sys模块
 
class Dog: # 定义 Dog 类
  pass
 
dog = Dog() # 创建一个dog对象
print(sys.getrefcount(dog)) # 打印对象的引用个数

>PS C:\Users\pierre\Desktop> python .\test.py
>2

import sys
 
class Dog:
  pass
 
dog = Dog()
dog2 = dog #添加一个指向dog的引用
print(sys.getrefcount(dog))

>PS C:\Users\pierre\Desktop> python .\test.py
>3