class methods in python

                                    @classmethod
def func(cls, args...)

                                    from datetime import date

# random Person
class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    @classmethod
    def fromBirthYear(cls, name, birthYear):
        return cls(name, date.today().year - birthYear)

    def display(self):
        print(self.name + "'s age is: " + str(self.age))

person = Person('Adam', 19)
person.display()

person1 = Person.fromBirthYear('John',  1985)
person1.display()

                                    class Person:
  def __init__(self, _name, _age):
    self.name = _name
    self.age = _age
   
  def sayHi(self):
    print('Hello, my name is ' + self.name + ' and I am ' + self.age + ' years old!')
    
p1 = Person('Bob', 25)
p1.sayHi() # Prints: Hello, my name is Bob and I am 25 years old!

                                    class Fan:

    def __init__(self, company, color, number_of_wings):
        self.company = company
        self.color = color
        self.number_of_wings = number_of_wings
        
    def PrintDetails(self):
        print('This is the brand of',self.company,'its color is', self.color,' and it has',self.number_of_wings,'petals')
    
        
    def switch_on(self):
        print("fan started")
        
    def switch_off(self):
        print("fan stopped")
        
    def speed_up(self):
        print("speed increased by 1 unit")
        
    def speed_down(self):
        print("speed decreased by 1 unit")
        
usha_fan = Fan('usha','skin',5)
fan = Fan('bajaj','wite', 4)


print('these are the details of this fan')
usha_fan.PrintDetails()
print()

usha_fan.switch_on()

                                    class uneclasse():
  def __init__(self):
    pass
  def something(self):
    pass
xx = uneclasse()
xx.something()