1 Object-oriented understanding
Process-oriented: write code from top to bottom according to business logic.
Object-oriented: classify and encapsulate functions to make development "faster, better, and stronger...
Example:
Zhang San is eating.
Facing the process
1 Zhang San feels hungry.
2 Wants to eat somewhere.
3 Waiting for the end of work time.
4 Waiting in line. . .
5 Choose dishes
6..
7.
8.. .
Object-oriented
Zhang San. Eat ()
Since object-oriented can make development "faster, better, and stronger..., how to do it, can it be achieved. The
steps are as follows:
#掌握一门面向的编程语言
面向对象语言 python java js php go
#要理解面向对象,必须先要理解 类和对象?
类: 指的是类型
对象: 指的是该类型下的具体哪一个
类和对象的关系
类是对象的抽象,对象是类的具体
类一个 对象多个
类的定义:具有相同属性和行为的一组对象的集合
举例:
张三是人类
李四是人类
对象: 张三 李四
类: 人类
#按照python定义类的语法 ,去定义类
语法
class 类名(父类):
#定义属性
属性的名=值
#定义行为(方法)
def 方法名(self,参数):
#方法体
#定义人类
class people():
#定义属性
name="tom"
age =22
#定义行为
def eat(self):
print(people.name,"在吃饭。。")
# 创建对象
#语法:
#对象名= 类名()
zhangshan=people()
# 通过对象去调用行为
zhangshan.eat()
2 The difference between static attributes and instance attributes
静态属性和实例属性
静态属性属于类,实例属性属于对象
class people():
#定义属性(静态属性)
name="李四"
#构造方法__init__
def __init__(self):
self.age = 0 # 实例属性(对象)
#定义行为
def eat(self):
print(people.name,self.age)
def run(self):
print(people.name,"在跑步。。")
#创建对象
zhangshan = people()
#通过对象调用属性
people.name="张三"
zhangshan.age=22
##通过对象调用行为
zhangshan.eat()
#创建对象
lishi = people()
lishi.age=32
##通过对象调用行为
lishi.eat()
3. The init method
构造方法,通过类创建对象时,自动触发执行 ,是个特殊方法
创建对象时,给属性赋值
class people():
#self当前对象
#构造方法__init__
#过类创建对象时,自动触发执行
#创建对象时,给属性赋值
def __init__(self,name,age):
self.age = age # 实例属性(对象)
self.name=name
def showinfo(self):
print("名字:",self.name)
print("年龄:",self.age)
#创建对象
zhangshan = people("张三",22)
zhangshan.showinfo()
print("-------------")
lishi = people("李四",32)
lishi.showinfo()
4.self current object
class People():
def __init__(self,name,age):
self.name=name
self.age=age
def show(self):
print(self.name,self.age)
p1 = People('张三',22)
p1.show()
p2 = People('张三2',12)
p2.show()
#当程序执行p1 = People('张三',22) self 就是 p1
#当程序执行p2 = People('张三2',12)self 就是 p2