Python

1. Environment python3.6 Libraries needed: RE, OS, requests 2. IntroductionKing Glory can be regarded as one of the more popular hand tours, there should be a lot of people into the pit of pesticides, we are today's purpose is to

1while statement, when the condition is true, it will continue to loop, such as the following example, but can be used ctral + C to force the endWhile ' C ': print ("I Love You")2. Observe the number of printsi = 10while i > 0: print ("I Love

ObjectiveSuppose you execute a script (. py) use case for a minute, then 100 scripts take 100 minutes, and when your use case reaches 1000, it takes 1000 minutes, or 16 hours ...How can you save time by running multiple. py scripts in parallel? This

In the Python function, if the passed parameter is a list by default , then be aware that there is a pit here!!Into the pitdef F (x,li=[]): for in Range (x): li.append (i*i) printprint('---1---') F (4) Print('---2---') F (5)Expected

Use Selenium module to control browser launch Selenium control browserfrom = webdriver. Firefox () brower. Get ('http://www.baidu.com')Find elements in the page fromSelenium Import Webdriverbrowser=Webdriver. Firefox ()

First, the PIP appears abnormalA small number of children's shoes The following occurs when you open cmd input pip: did not provide a commanddid not provide a command? What the hell is this?The normal situation should be jiangzi.Second, the solution:

ObjectiveUsually before making an assertion, you first get the attributes of the elements on the interface and then compare them with the expected results. This article describes several common ways to get element attributes.First, get the page

Logging Module As the name implies, for the program log output, you can set the log level, format, output mode, etc., the basic use method is as follows:1, Logging.basicconfig Way      simple configuration, can only choose to output to the screen

The enumerate () function is used to combine a data object that can be traversed (such as a list, tuple, or string) into an index sequence, while listing data and data subscripts, typically used in a for loop.In plain English, it is to give a group

#!/usr/local/bin/python3#-*-coding:utf-8-*-name= "My wife is Mahongyan" #----------capitalized----------#print ( Name.capitalize ()) #----------character Statistics----------#print (Name.count (' m ')) #----------character beautiful

The gradient descent method (gradient descent), aka steepest descent (steepest descent), is the most common method for solving unconstrained optimization problems, it is an iterative method, and the main operation of each step is to solve the

Nine. Operators1. Arithmetic Operators operator Description Example + Add Two objects added a + B output result 30 - Reducing Get negative numbers or a number minus

The root user will report the following error when using Yum install-y python-pip:No Package Python-pip AvailableError:nothing to doHere's how to fix it:First install the Epel extension Source:Yum-y Install Epel-releaseAfter the update is complete,

Write a Python source file with a. py suffix nameUse the Python interpreter to execute the. py filePython interpreterCPython: The official version, developed by the C language, is the default for this, the most widely used interpreter.Use >>> as a

I. Basic procedures for file operations#1. Open the file, get the file handle and assign a value to a variable f1=open (' B.txt ', ' R ', encoding= ' utf-8 ')#2. manipulating files with a handle content=f1.read () print (content)#3. Close File * *

Understanding Mappings:A map is the correspondence of a key (index) and a value (data). A dictionary is a collection of key-value pairs that are unordered between key values. The curly braces denote {}, and Dict () are created, and the key-value

First, the initial knowledge of the moduleFirst, the file name cannot be the same as the imported module name. Because the system defaults to find the module name from the current file, if the file name and the imported module name, it is equivalent

This article mainly introduces about the Xlsxwriter library in Python simple analysis, has a certain reference value, now share to everyone, the need for friends can refer to First, Xlsxwriter basic usage, create xlsx file and add data Xlsxwriter

The content of this article is the Python syntax concatenation, now here to share to everyone, the need for friends can refer to the content of the article For I in range (begin, end)Balabala For I in liebiaoming:Balabala While

This article mainly introduces some CentOS Python production environment Deployment command, very good, with reference value, need to refer to the friend Just notes After getting a clean CentOS, initialize the Python environment with some commands