7.1. Add the fuel_used attribute inside __init__ method of Car class without changing its arguments and assign it a value of 0 liters.

7.2. Add the fuel_consumption attribute inside __init__ method of Car class, passing it as a method argument with default value of 7 (liters/100 km).

7.3. Add a drive method to the Car class that takes the distance argument of type int (km). If an instance of class had started - increment fuel_used with the proper value ( that is based on fuel_consumption variable and distance parameter values) and display the message "Currently driven {distance} km, total fuel used - {fuel_used} l". If the instance had not started, display "Start the car before driving!". .

7.4. Rewrite the method for the ElectricCar class, add and do not increment fuel_used (since electric car doesn't used fuel), change the successful message to "Currently driven {distance} km on electric motor", keep the unsuccessful message unchanged.