Solution

.gitignore

@@ -3,7 +3,7 @@
 *.iml
 .env
 .DS_Store
-venv/
+vevn/
 .pytest_cache/
 **__pycache__/
 **db.sqlite3

car/serializers.py

@@ -1,5 +1,35 @@
 from rest_framework import serializers
 
+from car.models import Car
+
 
 class CarSerializer(serializers.Serializer):
-    pass
+    manufacturer = serializers.CharField(max_length=64)
+    model = serializers.CharField(max_length=64)
+    horse_power = serializers.IntegerField(
+        min_value=0, max_value=100
+    )
+    is_broken = serializers.BooleanField()
+    problem_description = serializers.CharField(allow_null=True)
+
+    def create(self, validated_data):
+        return Car.objects.create(**validated_data)
+
+    def update(self, instance, validated_data):
+        instance.manufacturer = validated_data.get(
+            "manufacturer", instance.manufacturer
+        )
+        instance.model = validated_data.get(
+            "model", instance.model
+        )
+        instance.horse_power = validated_data.get(
+            "horse_power", instance.horse_power
+        )
+        instance.is_broken = validated_data.get(
+            "is_broken", instance.is_broken
+        )
+        instance.problem_description = validated_data.get(
+            "problem_description", instance.problem_description
+        )
+        instance.save()
+        return instance

main.py

@@ -1,9 +1,23 @@
 from car.models import Car
 
+from rest_framework.renderers import JSONRenderer
+
+from car.serializers import CarSerializer
+import io
+from rest_framework.parsers import JSONParser
+
 
 def serialize_car_object(car: Car) -> bytes:
-    pass
+    serializer = CarSerializer(instance=car)
+    json_data = JSONRenderer().render(serializer.data)
+    return json_data
 
 
-def deserialize_car_object(json: bytes) -> Car:
-    pass
+def deserialize_car_object(json: bytes):
+    stream = io.BytesIO(json)
+    data = JSONParser().parse(stream)
+    serializer = CarSerializer(data=data)
+    if serializer.is_valid(raise_exception=True):
+        car = serializer.save()
+        return car
+    return None