PYTHON教程之类
#1.创建类 #class 定义一个类, 后面的类别首字母推荐以大写的形式定义,比如Calculator. class可以先定义自己的属性, # 比如该属性的名称可以写为 name='Good Calculator'. class后面还可以跟def, 定义一个函数. # 比如def add(self,x,y): 加法, 输出print(x+y). 其他的函数定义方法一样,注意这里的self 是默认值. class Dog(): """A simple attempt to model a dog.""" #类的初始化__init__可以理解成初始化class的变量,取自英文中initial #最初的意思.可以在运行时,给初始值附值 def __init__(self, name, age): """Initialize name and age attributes.""" self.name = name#类的属性 self.age = age def sit(self):#类的方法 """Simulate a dog sitting in response to a command.""" print(self.name.title() + " is now sitting.") def roll_over(self): """Simulate rolling over in response to a command.""" print(self.name.title() + " rolled over!") #类的调用或者叫创建实例,调用类时要加() my_dog = Dog('willie', 6) your_dog = Dog('lucy', 3) #类的属性调用,my_dog.name print("My dog's name is " + my_dog.name.title() + ".") print("My dog is " + str(my_dog.age) + " years old.") #类的方法调用方法 my_dog.sit() print("\nMy dog's name is " + your_dog.name.title() + ".") print("My dog is " + str(your_dog.age) + " years old.") your_dog.sit()
运行结果:
"D:\Program Files\python\python.exe" "D:/Program Files/python/example/PYTHON教程之类.py" My dog's name is Willie. My dog is 6 years old. Willie is now sitting. My dog's name is Lucy. My dog is 3 years old. Lucy is now sitting. Process finished with exit code 0
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