Python path--day18--Object-oriented programming-classes and objects

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1, process-oriented programming

The core is the word ' process ', which refers to the steps to solve the problem, that is, what to do first

Writing a program based on this idea is like writing a pipeline, which is a mechanical way of thinking.

Advantages: Complex problem-flow. Then simplify

Cons: Poor scalability

2, Object-oriented

The core is ' object ', the object refers to the combination of characteristics and skills

Writing a program based on that thought is like creating a world in which you are the god of the world and a god-style way of thinking.

Advantages: Strong Scalability

Cons: Programming complexity is higher than process-oriented

1, class

An object is a combination of features and skills, and a class is a combination of features and skills of a series of objects.

2, in the real world: must first have the object, later with the development of human civilization summed up the class

object is a concrete existence, and a kind of abstract concept of class knowledge

3, in the program, it is important to ensure that: first define the class, then call the class to produce the object

Real-Life Objects: Object 1: Features: School="Oldboy"name="Ma Dongmei" Age=18Sex="female"Skills: Learning Course Object 2: Features: School="Oldboy"name="Sweet Honey" Age=21Sex="male"Skills: Learning Course Object 3: Features: School="Oldboy"name="Original Stone Open" Age=22Sex="male"Skills: Learning to choose a lesson the old boy in real life class: The same characteristics school="Oldboy"same skill-learning course selection" "

the object of real life

# # defines the class in the program

Class name (using Hump body):

# representing features with variables

#用函数表示技能

#注意: The code in the class is executed immediately at the stage of defining the class, and then the resulting name is stored in the class namespace.

You can pass the class name. __dict__ to view

Use. Object names to access the properties of the class, and the names defined in the class can be accessed through a point

The essential operation of the point is __dict__

# # Call Class

Class name Plus () to invoke the class

Attention:

Example ****************************************

1 #objects in the program2 #call class, or instantiation, to get an object3s1=oldboystudent ()4S2=oldboystudent ()5s3=oldboystudent ()6 7 #So, S1, S2, S3 are all the same, and these three have different properties besides similar attributes, which is used in __init__8 #Note: This method is executed after the object has been generated and is used only to initialize the object and can have arbitrary code, but must not have a return value9 classoldboystudent:Ten     ...... One     def __init__(self,name,age,sex): ASelf.name=name -Self.age= Age -self.sex=Sex the     ...... -  -  -S1=oldboystudent ('Lee Tank','male', 18)#first call the class to produce an empty object S1, and then call oldboystudent.__init__ (S1, ' Lee Tank ', ' male ', ') +S2=oldboystudent ('King Cannon','female', 38) -S3=oldboystudent ('Bull Grenade','male', 78)

the invocation of the class

Python path--day18--Object-oriented programming-classes and objects