table of Contents

Process-oriented programming

Facing step / process code code.

Features: step by step, a function output is the input of the next function.

Advantages: increased independence of the code; the process clear.

Disadvantages: a mistake, let the program directly bounced off.

Object-Oriented Programming

Against the object (object) code code.

Features: interaction between objects and objects.

Pros: change an object does not affect other objects.

Cons: very complex.

Classes and Objects

Class (template / category): divided objects have the same attributes and skills of objects belonging to the same class (own control).

Object: a series of characteristics (attributes) and skills (Method) combination.

After the first, class of objects.

class

Class name generally used hump body.

Stage class definition: code execution.

Function definition phase: detecting syntax, the code is not performed.

class Student():  # 可加括号也可以不加
    school = 'old boy' # 定义变量（给类添加属性）
    
    def choose_course(self): # 定义在类内部的函数一般称为方法（给类增加技能）
        pass

Objects

Definition object instance is also referred to as object.

stu1 = Student()  # stu1就是一个对象
stu1.choose_course()  # 对象使用类中的方法时，不需要加参数,因为实例化对象调用该方法时，python会自动将该实例化对象传给self

Unique features custom objects

Nature object similar to a class, but also a name space, but the name of the object space to store the object unique name, and class objects are stored in a common name. Therefore, we can directly target custom name alone.

class phone: # 定义一个类
    types = 'mobile phone'

    def __init__(self,brand,model_number,color,rom): # __init__可以直接初始化对象的属性，使对象可以添加独有的特征。
        print(self)
        self.brand = brand
        self.model_number = model_number
        self.color = color
        self.rom = rom

    def phone_comment(self): # 对象都可以使用这个自定义函数
        print('一般货色')

apple = phone('apple','iphone xR','black','128g')
print(apple.types)
print(apple.brand)
print(apple.model_number)
print(apple.color)
print(apple.rom)
apple.phone_comment()

< Main .phone Object AT 0x000001DE78CB8288>
Mobile Phone
Apple
iPhone xR
Black
128g
ships goods

Classes and data types

Everything in python objects are all data types.

The role of the object:

Reference (x = 10; y = x)
As the container-earth element (lis = [x, func, Student]
As a function parameter def func (x, func, Student)
As a function return values return x, func, Student

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