diff --git a/homework_04/main.py b/homework_04/main.py
new file mode 100644
index 0000000..e9b9687
--- /dev/null
+++ b/homework_04/main.py
@@ -0,0 +1,184 @@
+
+# homework_04/media.py
+# абстракции — через NotImplementedError
+
+class Storage:
+    """Абстракция хранилищ."""
+    def save(self, path, bytes_or_stream):
+        raise NotImplementedError
+    def load(self, path):
+        raise NotImplementedError
+    def delete(self, path):
+        raise NotImplementedError
+    def exists(self, path):
+        raise NotImplementedError
+
+class LocalStorage(Storage):
+    """Заглушки для локального диска."""
+    def save(self, path, bytes_or_stream):
+        # открыть файл и записать bytes_or_stream
+        pass
+    def load(self, path):
+        # вернуть байты/поток
+        return None
+    def delete(self, path):
+        # удалить файл
+        pass
+    def exists(self, path):
+        return True
+
+class S3Storage(Storage):
+    """Заглушки для s3-like."""
+    def __init__(self, bucket):
+        self.bucket = bucket
+    def save(self, path, bytes_or_stream):
+        # загрузить объект в bucket/path
+        pass
+    def load(self, path):
+        return None
+    def delete(self, path):
+        pass
+    def exists(self, path):
+        return True
+
+class MediaFile:
+    """Базовый медиа-файл."""
+    def __init__(self, name, size=0, created_at=None, owner=None,
+                 storage=None, path=None, meta=None):
+        self.name = name
+        self.size = size
+        self.created_at = created_at
+        self.owner = owner
+        self.storage = storage or LocalStorage()
+        self.path = path or name
+        self.meta = meta or {}  # общие метаданные
+
+    # --- CRUD ---
+    def save(self, bytes_or_stream=None):
+        """Сохранить контент и метаданные в storage по self.path."""
+        self.storage.save(self.path, bytes_or_stream)
+    def load(self):
+        """Загрузить контент из storage."""
+        return self.storage.load(self.path)
+    def delete(self):
+        """Удалить из storage."""
+        self.storage.delete(self.path)
+
+    # --- Бизнес-операции (заглушки) ---
+    def convert(self, **params):
+        """Сконвертировать в другой формат/профиль, вернуть новый объект."""
+        raise NotImplementedError
+    def extract_features(self, **params):
+        """Извлечь фичи (превью, спектр, EXIF...), вернуть dict."""
+        raise NotImplementedError
+    def validate(self):
+        """Проверить согласованность метаданных/контента."""
+        return True
+
+class AudioFile(MediaFile):
+    """Аудио-метаданные: bitrate, sample_rate, channels, codec..."""
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.meta.setdefault("bitrate", None)
+        self.meta.setdefault("sample_rate", None)
+        self.meta.setdefault("channels", None)
+        self.meta.setdefault("codec", None)
+
+    def convert(self, target_codec=None, bitrate=None, sample_rate=None, **_):
+        # вернёт новый AudioFile с обновлёнными метаданными/путём
+        new_name = self.name + ".conv"
+        return AudioFile(new_name, storage=self.storage, path=new_name,
+                         meta={
+                             "bitrate": bitrate or self.meta["bitrate"],
+                             "sample_rate": sample_rate or self.meta["sample_rate"],
+                             "channels": self.meta["channels"],
+                             "codec": target_codec or self.meta["codec"],
+                         })
+
+    def extract_features(self, **_):
+        # вернёт, например, длительность и спектральные признаки
+        return {"duration_sec": None, "mfcc": None}
+
+class VideoFile(MediaFile):
+    """Видео-метаданные: resolution, fps, vcodec, acodec, duration..."""
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.meta.setdefault("resolution", None)
+        self.meta.setdefault("fps", None)
+        self.meta.setdefault("vcodec", None)
+        self.meta.setdefault("acodec", None)
+        self.meta.setdefault("duration", None)
+
+    def convert(self, resolution=None, fps=None, vcodec=None, **_):
+        new_name = self.name + ".conv"
+        return VideoFile(new_name, storage=self.storage, path=new_name,
+                         meta={
+                             "resolution": resolution or self.meta["resolution"],
+                             "fps": fps or self.meta["fps"],
+                             "vcodec": vcodec or self.meta["vcodec"],
+                             "acodec": self.meta["acodec"],
+                             "duration": self.meta["duration"],
+                         })
+
+    def extract_features(self, **_):
+        # ключевые кадры, превью, цветовая гистограмма
+        return {"thumbnails": None, "keyframes": None, "color_hist": None}
+
+class PhotoFile(MediaFile):
+    """Фото-метаданные: width, height, exif, colorspace..."""
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.meta.setdefault("width", None)
+        self.meta.setdefault("height", None)
+        self.meta.setdefault("exif", {})
+        self.meta.setdefault("colorspace", None)
+
+    def convert(self, colorspace=None, size=None, **_):
+        new_name = self.name + ".conv"
+        new_meta = dict(self.meta)
+        if colorspace is not None:
+            new_meta["colorspace"] = colorspace
+        if size is not None:
+            new_meta["width"], new_meta["height"] = size
+        return PhotoFile(new_name, storage=self.storage, path=new_name, meta=new_meta)
+
+    def extract_features(self, **_):
+        # гистограммы, лица, EXIF
+        return {"faces": None, "histogram": None, "exif": self.meta.get("exif", {})}
+
+# ---- Примеры использования ----
+
+def examples():
+    local = LocalStorage()
+    s3 = S3Storage(bucket="media")
+
+    # Создание
+    a = AudioFile("song.mp3", storage=local, meta={"bitrate": 320, "sample_rate": 44100, "channels": 2, "codec": "mp3"})
+    v = VideoFile("clip.mp4", storage=s3, meta={"resolution": "1920x1080", "fps": 30, "vcodec": "h264"})
+    p = PhotoFile("pic.jpg", storage=local, meta={"width": 4000, "height": 3000, "colorspace": "sRGB"})
+
+    # Save / Load / Delete
+    a.save(bytes_or_stream=None)     # записать контент
+    data = a.load()                  # прочитать
+    a.delete()                       # удалить
+
+    # Действия
+    a2 = a.convert(target_codec="aac", bitrate=256)
+    feats_a = a.extract_features()
+
+    v2 = v.convert(resolution="1280x720", fps=24)
+    feats_v = v.extract_features()
+
+    p2 = p.convert(colorspace="AdobeRGB", size=(2048, 1536))
+    feats_p = p.extract_features()
+
+    # Работа с разными хранилищами прозрачно:
+    p2.save()
+    v2.save()
+
+
+
+
+
+if __name__ == "__main__":
+    examples()
\ No newline at end of file
diff --git a/homework_05/base.py b/homework_05/base.py
index 9788beb..f69aee8 100644
--- a/homework_05/base.py
+++ b/homework_05/base.py
@@ -2,8 +2,34 @@
 Доработайте класс `Vehicle`
 """
 
-from abc import ABC
+from homework_05 import exceptions
 
 
-class Vehicle(ABC):
-    pass
+class Vehicle:
+    weight: int = 1500
+    started: bool = False
+
+    fuel: float = 0
+    fuel_consumption: float = 0
+
+    def __init__(self, weight: int = 1500, fuel: float = 0, fuel_consumption: float = 0):
+        self.weight = weight
+        self.fuel = fuel
+        self.fuel_consumption = fuel_consumption
+        self.started = False
+
+    def start(self):
+        """Запуск двигателя: проверяем топливо и меняем состояние"""
+        if not self.started:
+            if self.fuel > 0:
+                self.started = True
+            else:
+                raise exceptions.LowFuelError("Невозможно запустить двигатель — нет топлива")
+
+    def move(self, distance: float):
+        """Проверка топлива и движение"""
+        fuel_needed = distance * self.fuel_consumption
+        if self.fuel >= fuel_needed:
+            self.fuel -= fuel_needed
+        else:
+            raise exceptions.NotEnoughFuel("Недостаточно топлива для движения")
\ No newline at end of file
diff --git a/homework_05/car.py b/homework_05/car.py
index 1947f4b..ffffc7e 100644
--- a/homework_05/car.py
+++ b/homework_05/car.py
@@ -1,3 +1,12 @@
 """
 Создайте класс `Car`, наследник `Vehicle`
 """
+from homework_05.base import Vehicle
+from homework_05.engine import Engine
+
+
+class Car(Vehicle):
+    engine: Engine = None
+
+    def set_engine(self, engine: Engine):
+        self.engine = engine
\ No newline at end of file
diff --git a/homework_05/engine.py b/homework_05/engine.py
index d3c4b61..4c662a4 100644
--- a/homework_05/engine.py
+++ b/homework_05/engine.py
@@ -1,3 +1,10 @@
 """
 Создайте dataclass `Engine`
 """
+from dataclasses import dataclass
+
+
+@dataclass
+class Engine:
+    volume: float
+    pistons: int
\ No newline at end of file
diff --git a/homework_05/exceptions.py b/homework_05/exceptions.py
index a3feff8..6f12072 100644
--- a/homework_05/exceptions.py
+++ b/homework_05/exceptions.py
@@ -4,3 +4,16 @@
 - NotEnoughFuel
 - CargoOverload
 """
+class LowFuelError(Exception):
+    """Выбрасывается, если топлива недостаточно для запуска"""
+    pass
+
+
+class NotEnoughFuel(Exception):
+    """Выбрасывается, если топлива недостаточно для движения"""
+    pass
+
+
+class CargoOverload(Exception):
+    """Выбрасывается, если перегружен самолёт"""
+    pass
\ No newline at end of file
diff --git a/homework_05/plane.py b/homework_05/plane.py
index 1f37f69..52832ae 100644
--- a/homework_05/plane.py
+++ b/homework_05/plane.py
@@ -1,3 +1,28 @@
 """
 Создайте класс `Plane`, наследник `Vehicle`
 """
+from homework_05.base import Vehicle
+from homework_05 import exceptions
+
+
+class Plane(Vehicle):
+    cargo: float = 0
+    max_cargo: float
+
+    def __init__(self, weight: int = 1500, fuel: float = 0, fuel_consumption: float = 0, max_cargo: float = 0):
+        super().__init__(weight, fuel, fuel_consumption)
+        self.max_cargo = max_cargo
+        self.cargo = 0
+
+    def load_cargo(self, cargo: float):
+        """Добавляем груз, проверяя перегруз"""
+        if self.cargo + cargo <= self.max_cargo:
+            self.cargo += cargo
+        else:
+            raise exceptions.CargoOverload("Превышен лимит груза")
+
+    def remove_all_cargo(self) -> float:
+        """Возвращает старый груз и очищает трюм"""
+        old_cargo = self.cargo
+        self.cargo = 0
+        return old_cargo
\ No newline at end of file
diff --git a/homework_05/test.py b/homework_05/test.py
new file mode 100644
index 0000000..fd3242d
--- /dev/null
+++ b/homework_05/test.py
@@ -0,0 +1,17 @@
+from homework_05.car import Car
+from homework_05.engine import Engine
+from homework_05.plane import Plane
+
+car = Car(fuel=50, fuel_consumption=5)
+car.start()
+car.move(5)
+print(car.fuel)  # остаток топлива
+
+engine = Engine(volume=2.0, pistons=4)
+car.set_engine(engine)
+print(car.engine)
+
+plane = Plane(fuel=100, fuel_consumption=10, max_cargo=200)
+plane.load_cargo(100)
+print(plane.cargo)
+print(plane.remove_all_cargo())
\ No newline at end of file
diff --git a/homework_05/test_homework_05.py b/homework_05/test_homework_05.py
new file mode 100644
index 0000000..62b212a
--- /dev/null
+++ b/homework_05/test_homework_05.py
@@ -0,0 +1,55 @@
+import pytest
+from homework_05.base import Vehicle
+from homework_05.car import Car
+from homework_05.engine import Engine
+from homework_05.plane import Plane
+from homework_05 import exceptions
+
+
+def test_vehicle_start_success():
+    v = Vehicle(fuel=10, fuel_consumption=1)
+    v.start()
+    assert v.started is True
+
+
+def test_vehicle_start_no_fuel():
+    v = Vehicle(fuel=0, fuel_consumption=1)
+    with pytest.raises(exceptions.LowFuelError):
+        v.start()
+
+
+def test_vehicle_move_success():
+    v = Vehicle(fuel=10, fuel_consumption=2)
+    v.start()
+    v.move(3)  # тратим 6 топлива
+    assert v.fuel == 4
+
+
+def test_vehicle_move_not_enough_fuel():
+    v = Vehicle(fuel=5, fuel_consumption=2)
+    v.start()
+    with pytest.raises(exceptions.NotEnoughFuel):
+        v.move(10)
+
+
+def test_car_set_engine():
+    car = Car(fuel=20, fuel_consumption=5)
+    engine = Engine(volume=2.0, pistons=4)
+    car.set_engine(engine)
+    assert car.engine == engine
+
+
+def test_plane_load_and_remove_cargo():
+    plane = Plane(fuel=50, fuel_consumption=5, max_cargo=100)
+    plane.load_cargo(40)
+    assert plane.cargo == 40
+
+    removed = plane.remove_all_cargo()
+    assert removed == 40
+    assert plane.cargo == 0
+
+
+def test_plane_overload():
+    plane = Plane(fuel=50, fuel_consumption=5, max_cargo=50)
+    with pytest.raises(exceptions.CargoOverload):
+        plane.load_cargo(100)
\ No newline at end of file