class Demo:
   count = 0

   def __init__(self):
      Demo.count = Demo.count + 1

   def getcount(self):
      return Demo.count

return self.count

Demo.count = 314

class Demo:
   @staticmethod
   def static(arg1, arg2, arg3):
      #没有'self'参数！
      ...

从 datetime 导入 date
类 Student:
   def __init__(self, name, age):
      self.name = name
      self.age = age

   # 一个类方法
   @classmethod
   def birthYear(cls, name, year):
      return cls(name, date.today().year - year)

   # 一个静态方法
   # 如果 Student 的年龄超过 18 岁或不到 18 岁
   @staticmethod
   def checkAdult(age):
      return age > 18

# 创建 4 个对象
st1 = Student('Jacob', 20)
st2 = Student('John', 21)
st3 = Student.birthYear('Tom', 2000)
st4 = Student.birthYear('Anthony', 2003)

print("Student1 Age = ",st1.age)
print("Student2 Age = ",st2.age)
print("Student3 Age = ",st3.age)
print("Student4 Age = ",st4.age)

# 显示结果
print(Student.checkAdult(22))
print(Student.checkAdult(20))

Student1 Age =  20
Student2 Age =  21
Student3 Age =  22
Student4 Age =  19
True
True