class Person:
    def __init__(self, name, birthdate):
        self.name = name
        self.birthdate = birthdate


class Birthdate:
    def __init__(self, year, day):
        self.year = year
        self.day = day


class Day:
    def __init__(self, day, month):
        self.day = day
        self.month = month

@@ -37,24 +37,25 @@
  name, birth
+_
 date):%0A     
@@ -88,24 +88,25 @@
   self.birth
+_
 date = birth
@@ -101,24 +101,25 @@
 date = birth
+_
 date%0A%0A%0Aclass
@@ -124,17 +124,17 @@
 ss Birth
-d
+D
 ate:%0A   
@@ -161,17 +161,18 @@
 year, da
-y
+te
 ):%0A     
@@ -206,23 +206,25 @@
  self.da
-y
+te
  = da
-y
+te
 %0A%0A%0Aclass
@@ -226,17 +226,18 @@
 class Da
-y
+te
 :%0A    de
@@ -316,8 +316,67 @@
 = month%0A
+%0A    def write_into(self, list):%0A        list.append(self)%0A

Rename class and attribute