Dasturiy injinering

class SchoolMember:
'''Maktabdagi ixtiyoriy shaxsni ifoda etadi.'''
def __init__(self, name, age):
self.name = name
self.age = age
print('(SchoolMember hosil qilindi: {0})'.format(self.name))
def tell(self):
'''Ma'lumotni chop qilish.'''
print('Ismi:"{0}" Yoshi:"{1}"'.format(self.name, self.age), end=" ")
class Teacher(SchoolMember):
'''O'qituvchilarni ifoda etadi.'''
def __init__(self, name, age, salary):
SchoolMember.__init__(self, name, age)
self.salary = salary
print('(Teacher hosil qilindi: {0})'.format(self.name))
def tell(self):
SchoolMember.tell(self)
print('Maoshi: "{0:d}"'.format(self.salary))
class Student(SchoolMember):
'''Talabalarni ifoda etadi.'''
def __init__(self, name, age, marks):
SchoolMember.__init__(self, name, age)
self.marks = marks
print('(Student hosil qilindi: {0})'.format(self.name))
def tell(self):
SchoolMember.tell(self)
print('Bahosi: "{0:d}"'.format(self.marks))
t = Teacher('Mrs. Shrividya', 40, 30000)
s = Student('Swaroop', 25, 75)
print() # Bo'sh qator chop qiladi
members = [t, s]
for member in members:
member.tell() # O'qituvchi uchun ham talaba uchun ham ishlaydi
Natija:
$ python3 inherit.py
(SchoolMember hosil qilindi: Mrs. Shrividya)
(Teacher hosil qilindi: Mrs. Shrividya)
(SchoolMember hosil qilindi: Swaroop)
(Student hosil qilindi: Swaroop)
Ismi:"Mrs. Shrividya" Yoshi:"40″ Maoshi: "30000"
Ismi:"Swaroop" Yoshi:"25″ Baxosi: "75"
Bu qanday ishlaydi:
Meros olish imkoniyatidan foydalanish uchun klassni e'lon qilish joyida shu klass nomidan keyinoq kortejda asos klass nomini ko'rsatamiz. Asos klassning __init__ metodida obyekt qismining asos klassga tegishli bo'lgan xusisiyatlarni inisializatsiya qilamiz. Buni eslab qolish juda muhim: Python asos klassning __init__ metodini avtomat tarzda chaqirmaydi, uni ochiq oydin qilib chaqirish kerak bo'ladi.