python基础之类

1|0类的示例

class Dog():
	def __init__(self,name,age):
		self.name = name
		self.age = age
 
	def sit(self):
		print(self.name.title() + " is now sitting")
 
	def roll_over(self):
		print(self.name.title() + " rolled over")
 
my_dog = Dog('willie',6)   #实例化类
your_dog = Dog('luck',3)
print("My dog name is " + my_dog.name.title() + '.')    #调用类的属性
print("My dog is " + str(my_dog.age) + ' years old.')
my_dog.sit()    #调用类的方法
my_dog.roll_over()
 
print("\nYour dog name is " + your_dog.name.title() + '.')
print("Your dog is " + str(your_dog.age) + ' years old.')
your_dog.sit()
your_dog.roll_over()

2|0类的实例和操作

class Car():
	def __init__(self,make,model,year):
		self.make = make
		self.model = model
		self.year = year
		self.odometer_reading = 0    #默认值
 
	def get_descriptive_name(self):
		long_name = str(self.year) + ' ' + self.make + " " + self.model
		return long_name.title()
 
	def read_opometer(self):
		print("This car has " + str(self.odometer_reading) + " miles on it.")
 
	def update_odometer(self,mileage):    #修改类属性
		if mileage >= self.odometer_reading:
			self.odometer_reading = mileage
		else:
			print('You can not roll back an odometer')
 
	def increment_odometer(self,miles):
		self.odometer_reading += miles 
 
my_new_car = Car('audi','a8',2020)
print(my_new_car.get_descriptive_name())
my_new_car.update_odometer(23)
my_new_car.read_opometer()
my_new_car.increment_odometer(100)
my_new_car.read_opometer()

3|0类的继承

class Car():
	def __init__(self,make,model,year):
		self.make = make
		self.model = model
		self.year = year
		self.odometer_reading = 0
 
	def get_descriptive_name(self):
		long_name = str(self.year) + ' ' + self.make + " " + self.model
		return long_name.title()
 
	def read_opometer(self):
		print("This car has " + str(self.odometer_reading) + " miles on it.")
 
	def update_odometer(self,mileage):
		if mileage >= self.odometer_reading:
			self.odometer_reading = mileage
		else:
			print('You can not roll back an odometer')
 
	def increment_odometer(self,miles):
		self.odometer_reading += miles 
 
	def fill_gas_tank(self):
		print("This is car")
 
class ElectricCar(Car):   #继承Car类
	def __init__(self,make,model,year):  
		super().__init__(make,model,year)   #继承父类的属性
		self.battery_size = 70
 
	def describe_battery(self):
		print("This car has a  " + str(self.battery_size) + "kwh battery")
 
	def fill_gas_tank(self):  #重写父类的方法
		print("This car does not need a gas tank!")
		
my_tesla = ElectricCar('tesla','model',2021)
print(my_tesla.get_descriptive_name())
my_tesla.describe_battery()
my_tesla.fill_gas_tank()

__EOF__

本文作者：Harry
本文链接：https://www.cnblogs.com/harry66/p/13768115.html
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