类
创建和使用类
创建 Dog 类
class Dog:
def __init__(self, name, age):
self.name = name
self.age = age
def sit(self):
print(f"{self.name} is now sitting.")
def roll_over(self):
print(f"${self.name} rolled over")
init() 初始化方法，创建实例的时候会调用它
根据类创建实例
class Dog:
def __init__(self, name, age):
self.name = name
self.age = age
self.feather = 'thick'
def sit(self):
print(f"{self.name} is now sitting.")
def roll_over(self):
print(f"{self.name} rolled over.")
my_dog = Dog('willie', 6)
print(my_dog.name)
print(my_dog.age)
print(my_dog.feather)
my_dog.sit()
my_dog.roll_over()
my_dog.feather = 'thin'
print(my_dog.feather)
输出 willie 6 thick willie is now sitting. willie rolled over. thin
继承
class Dog:
def __init__(self, name, age):
self.name = name
self.age = age
self.feather = 'thick'
def sit(self):
print(f"{self.name} is now sitting.")
def roll_over(self):
print(f"{self.name} rolled over.")
class Gift:
def __init__(self):
self.gift = 'bone'
class Husky(Dog):
def __init__(self, name, age):
super().__init__(name, age)
self.size = 'big'
self.gift = Gift()
def describe_mouth(self):
print(f"Husky has a {self.size} body.")
husky = Husky('husky', 10)
print(husky.name)
print(husky.age)
print(husky.gift.gift)
husky.describe_mouth()
输出 husky 10 bone Husky has a big body.
导入类
导入单个类
from dog import Dog, Gift
from dog import *
from dog import Dog as dg