Implement Base and Derived Classes

Summary

Create a base class and extend it with derived classes that add attributes and override behavior.

Problem statement

You will implement a simple class hierarchy. Create a Vehicle base class with make, model, and year attributes. Implement methods: - description(): returns a string in the format "{year} {make} {model}". - age(current_year): returns the vehicle's age as an integer (current_year - year). Then implement two subclasses: - ElectricVehicle: adds battery_capacity (an integer representing kWh) and overrides description() to append " ({battery_capacity} kWh)" to the base description. - Motorcycle: adds has_sidecar (boolean, default False) and overrides description() to append " with sidecar" if has_sidecar is True, otherwise return the base description. Follow the starter code and fill in the TODOs. Return values are strings or integers as specified.

Task

Implement a Vehicle base class and two derived classes (ElectricVehicle and Motorcycle) that extend and override methods.

Examples

Input format

A class-based API. Tests will instantiate classes and call methods, e.g. Vehicle('Toyota','Corolla',2010).description()

Output format

Methods should return strings or integers. The test harness evaluates expressions and compares their string form.

Constraints

- Use standard Python classes. - Do not print; methods must return values. - year and battery_capacity are integers. has_sidecar is a boolean.

Samples