car.py

'''
CS 115, Lab 12, Inheritance

Author: Bharddwaj Vemulapalli
Pledge:I pledge my honor that I have abided by the Stevens Honor System.
Username: bvemulap

'''

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Question 1 (15 points)
' Implement missing sections of the Car class.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
class Car(object):
    '''Write the constructor below. It should take in four arguments:
       - make (a string)
       - model (a string)
       - mpg (miles per gallaon, a float)
       - tank_capacity (capacity of the gas tank in gallons, a float)
       The fields must be private.
       7 points'''
    def __init__(self,make,model,mpg,tank_capacity):
        self.__make = make
        self.__model = model
        try:
            mpg = float(mpg)
        except:
            raise TypeError(f"Error {mpg} could not be converted to a float")
        if mpg < 0:
            raise ValueError(f"{mpg} cannot be less than 0")
        self.__mpg = mpg
        
        try:
            tank_capacity = float(tank_capacity)
        except:
            raise TypeError(f"Error {tank_capacity} could not be converted to a float")
        if tank_capacity < 0:
            raise ValueError(f"{tank_capacity} cannot be less than 0")
        self.__tank_capacity = tank_capacity
        
    '''Write properties for mpg and tank_capacity. 2 points each'''
    @property
    def mpg(self):
        return self.__mpg
    @property
    def tank_capacity(self):
        return self.__tank_capacity

    '''Write setters for mpg and tank_capacity. 2 points each'''
    @mpg.setter
    def mpg(self,mpg):
        self.__mpg = mpg
    @tank_capacity.setter
    def tank_capacity(self,tank_capacity):
        self.__tank_capacity = tank_capacity

    '''Write a method called get_total_range.
       It returns the total distance the car can travel on a full tank of
       gas.
       4 points'''
    def get_total_range(self):
        return self.__tank_capacity * self.__mpg
    
    def __str__(self):
        return self.__make + ' ' + self.__model + ', MPG: ' + str(self.__mpg) \
            + ', tank capacity: ' + str(self.__tank_capacity)

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' Question 2 (15 points)
' Implement missing sections of the HybridCar class. HybridCar should be a
' subclass of Car.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
class HybridCar(Car):  # 2 points
    '''Write the constructor below. It should take in 6 arguments:
    - the first four are the same as in the Car constructor
    - battery_kWh (battery power in kilowatt-hours, a float)
    - miles_per_kWh (miles per kilowatt-hours, a float)
    The additional fields must be private.
    5 points'''
    def __init__(self,make,model,mpg,tank_capacity,battery_kWh,miles_per_kWh):
        super().__init__(make, model, mpg, tank_capacity)
        try:
            battery_kWh = float(battery_kWh)
        except:
            raise TypeError(f"Error {battery_kWh} could not be converted to a float")
        if battery_kWh < 0:
            raise ValueError(f"{battery_kWh} cannot be less than 0")
        self.__battery_kWh = battery_kWh
        
        try:
            miles_per_kWh = float(miles_per_kWh)
        except:
            raise TypeError(f"Error {miles_per_kWh} could not be converted to a float")
        if miles_per_kWh < 0:
            raise ValueError(f"{miles_per_kWh} cannot be less than 0")
        self.__miles_per_kWh = miles_per_kWh

    def get_battery_range(self):
        '''Returns the total distance the car can travel on a fully charged
        battery.
        4 points'''
        return self.__miles_per_kWh * self.__battery_kWh
 

    '''Override the method get_total_range.
    Returns the total distance the car can travel on a full tank of
    gas and a fully charged battery.
    Do not do any math here except a single +. To get credit, you must call
    the methods you have already written.
    4 points'''
    def get_total_range(self):
        return super().get_total_range() + self.get_battery_range()
    def __str__(self):
        return super().__str__() + ', battery kWh: ' + \
            str(self.__battery_kWh) + ', miles/kWh: ' + \
            str(self.__miles_per_kWh)