循环Python类中的对象实例

我只是好奇为什么第二个实例已经获得了在第一个实例创建中添加的类别。我怎么才能修好它?

class Game_record:


  category = []

  def __init__(self,name):
    self.name = name


  def add_category(self, cat):
     self.category.append(cat)   
  def reset_cat(self):
     self.category = []       
  def ret_cat(self):
      return self.category

game = ["a","b"]

for each in game:

  g = Game_record( each )
  g.add_category("kol")
  g.add_category("bol")
  print(g.ret_cat())
  g.reset_cat()
  print(g.ret_cat())

输出

['kol', 'bol']
[]
['kol', 'bol', 'kol', 'bol']
[]

问题来源StackOverflow 地址：/questions/59383692/object-instance-in-loop-python-classes