@staticmethod und @classmethod

   1 class A(object):
   2     def foo(self, x):
   3         print("executing foo({}, {})".format(self, x))
   4 
   5     @classmethod
   6     def class_foo(cls, x):
   7         print("executing class_foo({}, {})".format(cls, x))
   8 
   9     @staticmethod
  10     def static_foo(x):
  11         print("executing static_foo({})".format(x))
  12 
  13 a = A()
  14 
  15 a.foo(1)
  16 
  17 a.foo
  18 
  19 A.class_foo(1)
  20 
  21 A.class_foo
  22 
  23 a.class_foo(1)
  24 
  25 a.static_foo(1)
  26 
  27 A.static_foo('hi')
  28 
  29 
  30 class Date(object):
  31     def __init__(self, year=0, month=0, day=0):
  32         self.day = day
  33         self.month = month
  34         self.year = year
  35 
  36     def __repr__(self):
  37         return "It's the {}.{}.{}".format(self.day, self.month, self.year)
  38 
  39 Date(2014, 4, 1)
  40 
  41 string_date = '01-04-2014'
  42 day, month, year = map(int, string_date.split('-'))
  43 date1 = Date(year, month, day)
  44 date1
  45 
  46 
  47 class Date(object):
  48     def __init__(self, year=0, month=0, day=0):
  49         self.day = day
  50         self.month = month
  51         self.year = year
  52 
  53     def __repr__(self):
  54         return "It's the {}.{}.{}".format(self.day, self.month, self.year)
  55 
  56     @classmethod
  57     def from_string(cls, date_as_string):
  58         day, month, year = map(int, date_as_string.split('-'))
  59         date1 = cls(year, month, day)
  60         return date1
  61 
  62 Date.from_string('01-04-2014')
  63 
  64 date_as_string = '01-04-2014'
  65 day, month, year = map(int, date_as_string.split('-'))
  66 day <= 31 and month <= 12 and year <= 3999
  67 
  68 
  69 class Date(object):
  70     def __init__(self, year=0, month=0, day=0):
  71         self.day = day
  72         self.month = month
  73         self.year = year
  74 
  75     def __repr__(self):
  76         return "It's the {}.{}.{}".format(self.day, self.month, self.year)
  77 
  78     @staticmethod
  79     def is_date_valid(date_as_string):
  80         day, month, year = map(int, date_as_string.split('-'))
  81         return day <= 31 and month <= 12 and year <= 3999
  82 
  83 Date.is_date_valid('01-04-2014')