"""
Урок 71. Summary session 18 — весь код примеров одним файлом.

Источник: subjects/python-fundamentals/course/lessons/71-summary-session-18/examples.html
Файл собран автоматически (tools/build_lesson_examples.py): правьте страницу урока.
Запуск: python lesson-71.py
"""



# ====================================================================
# Пример 1. Базовое наследование
# ====================================================================
class Employee:
    def __init__(self, name: str) -> None:
        self.name = name

    def work(self) -> None:
        print(f"{self.name} is working...")


class Programmer(Employee):
    pass


class Manager(Employee):
    pass


p = Programmer("Alice")
m = Manager("Bob")
p.work()  # Alice is working...
m.work()  # Bob is working...


# ====================================================================
# Пример 2. Полиморфизм через переопределение
# ====================================================================
class Programmer(Employee):
    def work(self) -> None:
        print(f"{self.name} is writing code...")


class Manager(Employee):
    def work(self) -> None:
        print(f"{self.name} is managing team...")


staff = [Programmer("Alice"), Manager("Bob"), Programmer("Bill")]
for person in staff:
    person.work()


# ====================================================================
# Пример 3. super() в __init__
# ====================================================================
class Programmer(Employee):
    def __init__(self, name: str, language: str) -> None:
        super().__init__(name)
        self.language = language


p = Programmer("Alice", "Python")
print(p.name)       # Alice
print(p.language)   # Python


# ====================================================================
# Пример 4. super() в обычном методе
# ====================================================================
class Employee:
    def work(self) -> None:
        print("Employee is doing general tasks.")


class Programmer(Employee):
    def work(self) -> None:
        super().work()
        print("Programmer is writing code.")


class Manager(Employee):
    def work(self) -> None:
        super().work()
        print("Manager is holding a meeting.")


for person in [Programmer(), Manager()]:
    person.work()
    print()


# ====================================================================
# Пример 5. Цепочка наследования
# ====================================================================
class Person:
    def __init__(self, name: str) -> None:
        self.name = name
        print(f"Init Person: {self.name}")


class Employee(Person):
    pass


class Manager(Employee):
    def __init__(self, name: str, department: str) -> None:
        super().__init__(name)
        self.department = department
        print(f"Init Manager: {self.name} manages {self.department}")


m = Manager("Alice", "Development")
# Init Person: Alice
# Init Manager: Alice manages Development


# ====================================================================
# Пример 6. isinstance
# ====================================================================
class Animal:
    pass


class Dog(Animal):
    pass


d = Dog()
print(isinstance(d, Dog))      # True
print(isinstance(d, Animal))   # True
print(isinstance(d, object))   # True
print(isinstance(d, str))      # False
print(isinstance(d, (str, int, Animal)))  # True


# ====================================================================
# Пример 7. issubclass
# ====================================================================
class Employee:
    pass


class Programmer(Employee):
    pass


class BackendDeveloper(Programmer):
    pass


print(issubclass(Programmer, Employee))          # True
print(issubclass(BackendDeveloper, Programmer))  # True
print(issubclass(BackendDeveloper, Employee))    # True
print(issubclass(Employee, Programmer))          # False
print(issubclass(Employee, object))              # True