python oop course

From this Article At the beginning, I began to share some features of Python Oop, hoping to help you understand Python oop. In fact, Python OOP is different from other languages. Today I will talk about one aspect of private mecha

DFS steps are as follows: [d]-->[d,b]-->[d,b,a]-->[d,b,a,c]--> (the parent class of C is a, which already appears in front, remove the previous a)-->[d,b,c,a]　　Polymorphic (polymorphism): Simple to understand, different classes have the same method name (methods name), that is, there is the same interface, we can call the same method name in any instance of a class.But in fact, although these methods have the same name and are conceptually similar, internal operations are different.For example,

Python Course Selection System Development Program and python Course Selection System Development This program is developed for the Python Course Selection System for your reference. The specific content is as follows: Role:School

O bjectsSorts of program LanguagesMachine orintedMachine instructionsAssemblyProcedure orintedFollow steps and branch processingCObject orintedMulti-person, multi-departmental writingC + + Java Python Everything in Python, object-oriented, very thorough. Objects are encapsulated in data and operations Objects are independent, but objects can interact with each other At present,

class on the fly A . The parent class is object (note that the multiple-inheritance parent class is placed inside tuple .) Suppose there is only one parent class, the tuple has only one element, and the comma is not limited. And there is a af method named.metaclassMeta class * Class is equivalent to an instance of a meta class. Metaclass is the most difficult and difficult-to-use magic code for Python-oriented objects. Generally not used

Java, must specify a type when passing parameters, and Python does not have this limitation, which is one of the reasons why Python natively supports polymorphism.This paper mainly describes the three main characteristics of Python object-oriented, encapsulation, inheritance and polymorphism, inheritance has multiple inheritance, new inheritance and classical cl

type()function can either return the type of an object or create a new typeDEF fn (self, name= "World"): print ("Hello,%s!"% name) Hello = Type ("Hello", (object,), Dict (hello= fn)) h = Hello () >>> H.hello () Hello, world!>>> type (h) out[165]: __main__. hello>>> Type (Hello) out[166]: type To create a class object, the type() function passes through 3 parameters in turn: The name of the class; Inherited parent class Collection, note that

Self.score = Score Vincent = Student (' Vincent ', +) Lisa = Stud ENT (' Lisa ', 80)Encapsulation of dataAnother important feature of object-oriented is the encapsulation of data. In the above instance of the Student class, each instance has its own name and score data. We can access this data through functions, such as print scores:def print_score (self): print ('%s:%s '% (Self.name,self.score))sinceStudentThe instance itself has this data, to access the data, there is no need to access from t

of the same name to become the cloud, but the ice. to Cloud (), and vapor. Cloud () is a very different process, although the methods are all the sameIntrospection/ReflectionIntrospection, also known as reflection, shows how an object obtains its own information at run time. If you pass an object to you, you can find out what it is capable of, which is a powerful feature. If Python does not support some form of introspection, the Dir and type built-i

The object-oriented design of python is different from that of C ++. Note the following: Python classes do not have access permissions, that is, all variables are accessible.In fact, Python has a private mechanism, that is, adding __before the attribute, but this private mechanism is actually pseudo-private, because it actually uses an alias to store this att

() class method, class:__main__. Myclass,val1:value changed, cannot access the value of Val2 MYCLASS.CLASSMD () class method, class:__main__. Myclass,val1:value changed, unable to access the value of Val2Finally, the implementation and invocation of instance method, static method and class method are summarized.#!python2#-*-coding:utf-8-*-classMethods ():defim (SELF,V2): Self.v2=v2Print "Call instance method:%d"%v2 @staticmethoddefSM (v2):Print "Call static method:%d"%v2 @classmethoddefcm (CLS,

Python course day notes-la, python course-laHttp://www.cnblogs.com/onda/ ---------------------- 20170423 A: Cpython pypy difference; Cpython is a line of interpretation, pypy is the entire file interpretation II: pycharm use: 1: Create Project 2: Set Character Set utf8 3: set the default file creation start #! /Usr/bin

Python detailed process of crawling Coursera course resources, coursera Course Resources Sometimes we need to add some classic things to our favorites and review them from time to time. Some courses on Coursera are undoubtedly classic. Most of Coursera's finishing courses provide complete teaching resources, including ppt, video, and subtitles. It is very easy to

Course Cataloguewhat 01.scrapy is. mp4python Combat-02. Initial use of Scrapy.mp4The basic use steps of Python combat -03.scrapy. mp4python Combat-04. Introduction to Basic Concepts 1-scrapy command-line tools. mp4python Combat-05. This concept introduces the important components of 2-scrapy. mp4python Combat-06. Basic concepts introduce the important objects in 3-scrapy. mp4python combat -07.scrapy built-i