40methodclass in python

1class Date(object):
2
3    def __init__(self, day=0, month=0, year=0):
4        self.day = day
5        self.month = month
6        self.year = year
7
8    @classmethod
9    def from_string(cls, date_as_string):
10        day, month, year = map(int, date_as_string.split('-'))
11        date1 = cls(day, month, year)
12        return date1
13
14    @staticmethod
15    def is_date_valid(date_as_string):
16        day, month, year = map(int, date_as_string.split('-'))
17        return day <= 31 and month <= 12 and year <= 3999
18
19date2 = Date.from_string('11-09-2012')
20is_date = Date.is_date_valid('11-09-2012')