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+--- Thread: Electric Car battery size updating ???? (/thread-20906.html)
Electric Car battery size updating ???? - ridgerunnersjw - Sep-06-2019
Hello...
I copied the following out of a book as I am trying to teach myself Python....Can someone please tell me how I can create an instance of an ECar and modify the battery size to 85? I have tried everything under the moon and have not been successful updating an instance of an ECar with this as because the get_range method ALWAYS shows 240 which is the default of 70 ...I have been able to create a Battery instance and change it but I don't believe I can then use this to update the ECar because it is a totally different class....Thank you for your answers...
See code below......................
class Car():
"""A simple attempt to build a car"""
def __init__(self, make, model, year):
"""Initialize attributes to describe a car"""
self.make = make
self.model = model
self.year = year
self.odometer = 0
def get_descriptive_name(self):
"""Return a neatly formatted name"""
long_name = str(self.year) + ' ' + self.make + ' ' + self.model
return long_name.title()
def odometer_reading(self):
"""Read auto odometer"""
print('This car has ' + str(self.odometer)+ ' miles on it.')
def update_odometer(self, miles):
"""Updates the odometer reading with miles"""
if miles > self.odometer:
self.odometer = miles
else:
print ('You cannot roll back the odometer')
def increment_odometer(self, miles):
"""Add miles to existing odometer reading"""
self.odometer += miles
class Battery():
"""Model of Electric Car battery"""
def __init__(self, battery_size = 70):
"""Initialize Battery settings"""
self.battery_size = battery_size
def describe_battery(self):
"""Describes the Electric car battery"""
print('This car has a ' + str(self.battery_size) + '-kwh battery')
def get_range(self):
"""Tell range of battery"""
if self.battery_size == 70:
range = 240
elif self.battery_size ==85:
range = 270
else:
range = 0
msg = "This car can go about " + str(range)
msg += " miles on a full charge."
print (msg)
class ECar(Car):
"""Create an instance of an elecric car"""
def __init__(self, make, model, year):
"""Initialize parent attributes"""
super().__init__(make, model, year)
self.battery = Battery()
RE: Electric Car battery size updating ???? - metulburr - Sep-06-2019
You would just pass the battery size to Ecar arguments, and pass that along to Battery class like this
class ECar(Car):
"""Create an instance of an elecric car"""
def __init__(self, make, model, year, batt_size):
"""Initialize parent attributes"""
super().__init__(make, model, year)
self.battery = Battery(batt_size)
car = ECar('Tesla', 'Model X', 2016, 85)
print(car.battery.get_range())Output:This car can go about 270 miles on a full charge.
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