# Everything is object
# Method of encapsulating code , More advanced packaging
# object-oriented , Developed from a process oriented foundation , It is more flexible and extensible than process oriented
# Process oriented : object-oriented Programming is a way to solve problems , It refers to different solutions to the same problem
# Put the elephant in the refrigerator ：3 Step
# 1. Open the refrigerator door
# 2. Put the elephant in the refrigerator
# 3. Close the refrigerator door
# Student management system is process oriented , Add, modify and delete query tools are encapsulated into functions independently , Finally, call different functions in order
# Daily thinking to do
# Process oriented thinking
# 2. Put the elephant in the refrigerator
# 3. Close the refrigerator door
# 1, Open the refrigerator door
# When you use it 1. Open the refrigerator door 2. Put the elephant in the refrigerator 3. Close the refrigerator door
# Assembly line thinking wev Automatic open class Linear code Realize Baidu search
# 1. Open Google browser 2. Visit Baidu 3. Find the input box and enter the search content 4. Find the search button and click
# object-oriented : Create an object Leave what you want to do to this object
# Create an object
# Refrigerator objects
# The refrigerator has a way to open the door
# There are ways to pack things in the refrigerator ( Elephant , snacks , drinks )
# There are ways to close the refrigerator
# Programming solutions to problems
# object-oriented ： Focus on who will do
# Process oriented : An assembly line , A set of processes from beginning to end solve problems in order
# object-oriented , Process oriented Way better : Learning thinking Simple code Uncomplicated process Process oriented Element localization （ Tracking error )
# 1. Open Google 2. Visit the landing page 3. Find the input box and enter the user , Click password to login , Search for mobile phones , Add mobile phone to shopping cart
# A complex process Object oriented thinking to do
# object-oriented pom Page object
# Log in to a page object The login page Find the user name input box Find the password input box Find the login button The whole process of login Added a process Verification Code
# Add to cart page Look for color Find the quantity
# There are several students , The first student ：
# petty thief , Age 18 year , Gender female Can play games , Can play badminton
# Xiao Ming , Age 20 year , Gender male , Can eat chicken , Can play basketball
# Crooked , Age 60 year , Gender female , Can cook , Can knit sweaters
# Process oriented writing
# Define a Xiao Li , Age 18 year , Gender female Can play games , Can play badminton
# Define a Xiao Ming , Age 20 year , Gender male , Can eat chicken , Can play basketball
# Define a curve , Age 60 year , Gender female , Can cook , Can knit sweaters
# Get Xiao Li's information
# Just call Xiao Li's function
# Xiao Ming's function
# Object oriented writing
# Student object
# Student : name , Age , Gender Can play games Can play badminton Can eat chicken Can play basketball Can cook Can knit sweaters
# establish (' petty thief ',18, Woman ) Can play games Can play badminton
# (' Crooked ',60, Woman ) Can cook Can knit sweaters
# How many students are created How many students do you give him How many skills do students have
# object-oriented : Learn two names
# class : A general term for things with common characteristics or the same behavior
# birds : features : With wings , There are two feet , There's a pair of eyes , The heart has four chambers , The body temperature is constant
# Behavior : Can fly , Can eat worms
# Features are called ： attribute
# The act is called : Method
# Class is abstract It can't refer to specific things , Is a general template
# object ： Something specific Specifically, the parrot in aunt's house downstairs , The sparrow of Xiao Wang's family next door Different specific objects
# Defining classes
''' class Class name : Class properties Class method def Method 1(self): pass def Method 2(self): pass Class properties : The characteristics of things Class method : The behavior of things Class name : The first initial is capitalized Bridge '''
# game , There are several cats in the game , All are 20kg, The color is white , So I have a few 20 Jin white cat , A white cat can catch mice
# A white cat can eat fish , A white cat can eat fish, catch mice and make holes
# Write ？ Process oriented ？ Definition 3 Cats
# object-oriented : Create a template That is class
# Create every cat , weight , Color , Give the cat a name and change it by yourself
# use init Initialization function effect Just create class objects , It will carry out this init
# def test( Parameters , Parameters ):
# Variable name = Parameters
# name It's Emerald flowers weight yes 20 color It's black, white and grey
class Cat:
def __new__(cls,*args,**kwargs):
return object.__new__(cls)
def __init__(self,name,weight,color):
# The emerald flower is assigned to self.name, therefore self.name It's Emerald flowers . then self It represents the object itself , therefore tom1.name Cui Hua
self.name = name
self.weight = weight
self.color = color
def catch(self):
print(f'{
self} Small {
self.color} Cat catches mouse ')
def eat(self):
print(' Little white cat likes fish ')
def cave(self):
print(' Little white cat can make holes ')
def __str__(self):
return f' This is the description information of an object :{
self.name}{
self.color} The sad story of the cat '
def __del__(self):
print(f'{
self.name} The kitten hung up ')
# All the characteristics of white cats
# Class cannot be used directly
# Create specific objects That is, instantiating objects Object name = class () Object name . Method name Object name . attribute
# tom Little white cat
# self I do not know! Breakpoint look self Like object address self It seems to be an object
# Created an object self Can distinguish which object you are
tom1 = Cat()
tom1.catch()
# Create a specific cat that can catch mice
print('-'*50)
tom2 = Cat()
tom2.eat()
# Create a specific cat that can eat fish
print('-'*50)
tom3 = Cat()
tom3.eat()
tom3.catch()
tom3.cave()
# Create a specific cat that can eat fish, catch mice and make holes
# This is a 3 Cats I'm not sure if it's 3 Cats Monitor whether there are three cats ？ id testing
print(tom1,id(tom1))
print(tom2,id(tom2))
print(tom3,id(tom3))
# Cats are white , Can you make special , There is a cat with mutation Black and white cat
# Change the attributes of cats
tom1 = Cat()
tom1.cat_color = ' Black and white '
tom1.catch()
tom2 = Cat()
tom2.catch()
# tom1 Namely self
tom1 = Cat(' Cui Hua ','20',' Black and white grey ')
print(' The name is {} Small {} The cat story '.format(tom1.name,tom1.color))
print(tom1)
# to want to tom1 What I print out is my own customized thing
tom1.catch()
tom2 = Cat(' Under the moon ','20',' The cat under the moon ')
print(' The name is {} Small {} The cat story '.format(tom2.name,tom2.color))
# When will it be used in the project init function Create an object Use the content in the object I must do something before
# What must be done is written in init Inside
# Database configuration Database links
2. Magic methods
# use init Initialization function effect Just create class objects , It will carry out this init
# __str__ Object description method , As long as it's defined __str__ Method , Object will print the return
# __del__ Destroy object , Whether you write or not del function , Will be destroyed
# __new__ Create object of class
3. Homework :
# subject : Go to the bank to deposit and withdraw money
# Two dogs Bank Account 123456789 balance 500 Want to save money 200
# False bamboo Bank Account 23456789 balance 5 Want to withdraw money 100
# autumn waters Bank Account 3456789 balance 5 Billion Want to save money 1 Billion
class Bank:
def __init__(self,username,card_no,balance):
self.username = username
self.card_no = card_no
self.balance = balance
# Deposit money
def deposit(self,amount):
print('{} You are here to save money , save {}'.format(self.username,amount))
self.balance = self.balance + amount
# Withdraw money
def withdrawal(self,amount):
print(' I'm here to withdraw money , take {}'.format(amount))
if self.balance >= amount:
self.balance = self.balance - amount
else:
print(' Thinking about money is crazy , Step on it ')
def __str__(self):
return f' I am a {
self.username}, My account {
self.card_no}, The balance of my {
self.balance}'
# Original 500, Save 200, The balance is unchanged
ergou = Bank(' Two dogs ','123456789','500')
ergou.deposit(200)
print(ergou)
# Original account 5 Yuan Want to take 100 block No way Tips Judge that the account balance is greater than or equal to the withdrawal balance , Let you take , Remember to subtract from your account , Let you take , Otherwise, I'm crazy about money
xuzhu = Bank(' False bamboo ','123456789','5')
xuzhu.withdrawal(100)
print(xuzhu)
# The rest of the logic
# Two dogs save money , After saving, the money in the account did not increase
# False bamboo withdraws money , He still has money after withdrawing more than his balance
# object-oriented
# Classes and objects Create a class Only instantiated objects can be used
# self It represents your own
# init function del str
# 1.# Lose weight and grow up Classes and objects
# Xiao Ming weight 80 kg 160 Jin
# 1. Xiao Ming runs every time Will lose weight 0.5 kg
# 2. Every time you eat Weight gain 1 kg
# name Stars Cold lamp
class Person:
def __init__(self,name,weight):
self.name = name
self.weight = weight
# Give me a number of times to lose weight
def run(self,num):
print('%s Love running , Running to lose weight , reduce 0.5 Jin '%(self.name,self.weight))
self.weight = self.weight - 0.5*num
# When eating Give me a number Not sure
def eat(self,num):
print('%s Love to eat , Eat and get fat , Fat is fat 1 Jin '%(self.name,self.weight))
self.weight=self.weight+1*num
def __str__(self):
return " My name is %s, weight %.2f"%(self.name,self.weight)
# Create objects Object name = Class name ()
x = Person(' Stars ',80)
print(x)
# Eat something How to eat Every time you eat Weight gain 1 Jin The original weight should be added 1 Jin
x.eat()
print(x)
x.run()
print(x)
# Stars eat three meals a day ,3 Don't even exercise ,10 Ton
x.eat()
x.eat()
x.eat()
x.eat(3)
print(x)
x.run(3)
print(x)#
