Python

1 python copyDeep copy, shallow copy and reference three differencesImportCopya=[1,2,3,4, [' A ',' B ']]#原始对象B=A#赋值, a reference to a passing objectC=Copy.copy (a)#对象拷贝, Shallow copyD=Copy.deepcopy (a)#对象拷贝, deep copyA.append (5)#修改对象aa[4].append ('

Python rst File OpenRST is similar to Python Javadoc and Java.If you download someone else's Python source, there is an RST folder, we can turn to HTML after the browser openIndex.rst of an open source project1. Install the Python Sphinx module:Pip

Anaconda InstallationFirst go to Anaconda's official website, as shown, you will see the Anaconda download page:2, pull down or click the Windows option in the diagram to get the interface as shown, at this time you can choose according to their own

Service sideImportSocketserverclassMyserver (socketserver. Baserequesthandler):" "defines a class that must inherit the Baserequesthandler under Socketserver" " defhandle (self):#rewrite its internal handler method #internally encapsulated

1 Talk about your understanding of the HTTP protocol.2 Talk about your understanding of the WebSocket agreement.3 What is a magic string?4 How do I create a responsive layout?5 which front-end frames have you ever used?6 What is an AJAX request? and

First, what is the algorithm?The algorithm refers to the accurate and complete description of the solution, is a series of clear instructions to solve the problem, the algorithm represents a systematic approach to describe the problem-solving

If you convert a dictionary to JSON, you're familiar with it, but what if you convert the class class to a JSON object at the advanced point?1, first define a class# define a student class class Student (object): def __init__

MacOS:1. Install Pycharm and create a new project. Project interpreter selected the path of my locally installed python2.7:/usr/bin/python2. Open the Selenium Python language download page: https://pypi.org/project/selenium/, view the installation

Process-oriented programmingProcess-oriented core is the process, refers to the steps to solve the problem, that is, what to do first, as if designing a pipeline.Advantages: Complex problems are streamlined and simplifiedDisadvantage: Poor

In understanding the data structure of Python, the container (container), the Iteration object (iterable), the iterator (iterator), the generator (generator), the list/collection/dictionary derivation (list,set,dict Comprehension) Many concepts are

First, the format of the output1. Format the output by%The formatted output is to output a string in a fixed format, as it involves external input or the output of a template that needs to be used by a certain demand, resulting in the need to occupy

First of all, the linear table, linear table is one of the most basic, the simplest data structure, popular point is one-dimensional storage of data structure.Linear tables are divided into sequential tables and linked tables: Sequential

First, Scopecreating, changing, and locating variable names in a Python program is done in a space where variable names are stored, which we call namespaces, also known as scopes. The scope of the Python is static, and the location of the variable

10 Summary of function advanced knowledge points I. Third of the dynamic parameter parameters1. Dynamic Receive location parameter expression: *args (write * table in parameter location? receive any Content) (1) Dynamic position parametersDef eat

Python portal, print, basic data, variables Where does the code begin? (1) Python is executed from the time the first script is loaded.Python test.py(2) In the script to call the other script inside the code and dataRelated code, put

url = ' interface address 'r = Requests.get (URL) #发送get请求Print (R.status_code) #打印状态码, if redirected, returns the code after redirectionPrint (r.headers) #打印返回的报头 (head)Print (R.text) #查看返回结果的文本形式R.status_code #响应状态码R.content #字节方式的响应体 that will

Implement WordCount with Python on HadoopA simple explanationIn this example, we use Python to write a simple MapReduce program that runs on Hadoop, wordcount (reading text files and counting the word frequency of words). Here we will enter the

Background:Find out if Python's data types are mutable, or better understand Python's use of memory.Variable and immutable definitionsVariable data type: Defines a variable in python that, when the value of the variable is modified, the memory

Question input a certain day of the year, judging the day is the first of the year? AnalysisFor example: June 19, 2018Days = 19 days + January days + February days + ... + June daysAttention The February of a leap year is 29 days, and 1

#!/usr/bin/env python#Coding:utf-8 fromUrllibImportrequest, ParseImportOSImport TimeImportRandom fromUrllib.errorImportUrlerror, Httperror fromEmailImportencoders fromEmail.headerImportHeader fromEmail.mime.textImportMimetext