how to call method on class python code example

Example 1: @methodclass in python

class Date(object):

    def __init__(self, day=0, month=0, year=0):
        self.day = day
        self.month = month
        self.year = year

    @classmethod
    def from_string(cls, date_as_string):
        day, month, year = map(int, date_as_string.split('-'))
        date1 = cls(day, month, year)
        return date1

    @staticmethod
    def is_date_valid(date_as_string):
        day, month, year = map(int, date_as_string.split('-'))
        return day <= 31 and month <= 12 and year <= 3999

date2 = Date.from_string('11-09-2012')
is_date = Date.is_date_valid('11-09-2012')

Example 2: python call function in class

#------------------------------------
#CLASS
#------------------------------------
class Student:
  def __init__(self):
    self.name = None
    
  def set_name(self, word):
    self.name = word
    return self.get_name()
    
  def get_name(self):
    return self.name
  
#------------------------------------
# USAGE:
#------------------------------------

a = Student()
print(a.set_name("Hello"))