Python

6.1 The simplest crawler Web crawler is a program that automatically extracts Web pages, and it is an important component of search engine to download Web pages from the World Wide Web. Python's urllib\urllib2 and other modules are easy to

one, subprocess and commonly used encapsulation functions When we run Python, we are all creating and running a process. Like the Linux process, a process can fork a child process and let the child process exec another program. In Python, we fork a

Why write this program, why do not give this program GUI? The reason is very simple, because I am a command line control, Linux accustomed to not accustomed to the mouse, always feel like knocking orders faster, You are reading this article to

1.math Introduction The code is as follows: >>> Import Math>>>dir (Math) #这句可查看所有函数名列表>>>help (Math) #查看具体定义及函数0原型 2. Common functions The code is as follows: Ceil (x) Fetch topFloor (x) BottomFabs (x) Take absolute valueFactorial (x)

Receive mail The code is as follows: Import Poplib,pdb,email,re,timeFrom email import header Pop_addr = R ' pop.126.com 'USER = 'PASS = "CONFIG = " def getYear (date):RSLT = Re.search (R ' \b2\d{3}\b ', date)return int (Rslt.group ()) def getMonth

What would you do if you were to write a program that had X1 for 1,X2 2 and then until X100 was 100? In a static language like C, the variable name is actually translated directly into the memory address by the compiler, so there is no way to do

Python's built-in filter () function is used for filtering sequences. Like map (), filter () also receives a function and a sequence. When different from map (), filter () applies the incoming function to each element sequentially, and then

See examples directly: The code is as follows: #!/usr/bin/python#-*-Coding:utf-8-*-From BS4 import BeautifulSoupHtml_doc = "" "The Dormouse ' s story The Dormouse ' s story Once upon a time there were three Little sisters; and their names

Inside class, you can have properties and methods, and external code can manipulate the data by invoking the instance variable directly, thus hiding the complex logic inside. However, from the definition of the previous student class, the external

A bitwise operator computes a number as a binary. The bitwise algorithms in Python are as follows: Bitwise with (bitwise AND of x and Y) & Example: 5&3 = 1 Explanation: 101 11 The same bit is only digit 1, so the result is 1 bitwise OR (bitwise

In the C language, you can call system commands and get output with the systems function, and output redirection can also save the output of the program execution to a file for use, but it is not very convenient to use. Here I introduce the

First, open a Web page to get all the content from Urllib Import Urlopen Doc = Urlopen ( "Http://www.baidu.com" ) . Read () Print Doc Second, get the HTTP header from Urllib Import Urlopen Doc =

The code is as follows: #!/usr/bin/python# Encoding=utf-8# Filename:send_email.pyFrom Email.mime.image import MimeimageFrom Email.mime.multipart import MimemultipartFrom Email.mime.text import MimetextImport Smtplib Class SendEmail:# constructor:

The radix sorting method, also known as the bucket method (bucket sort) or bin sort, as the name implies, it is through the key value of the partial information, the elements to be sorted into some "barrels", in order to achieve the role of

The example that this section shares for you is the use of Wxpython frame. Example: The code is as follows: #!/usr/bin/python#-*-CODING:GBK-*-# simple.pyImport WXApp = WX. APP ()frame = wx. Frame (None)Frame. Show ()App. Mainloop () Example

First, installation of Eclipse The installation of Eclipse is easy. Eclipse is a Java-based application, so a Java Runtime Environment (JRE) is required. (I'm here to focus on installing under Windows) Download address for JRE:

Python is a simple and easy-to-learn programming language with simple and clear syntax and a rich and powerful class library. Unlike most other programming languages that use curly braces, it uses indentation to define the block of statements. In

Features such as folder and file lookup, deletion, etc. are implemented in the OS module. The module should be piloted into the application, The methods to import are: Import OS First, get the current directory s = OS.GETCWD () # s is the current

When it is not available or when reinstalling the system, it is convenient for us to reinstall the latest version. But each installation has to click several times Next button, but also to provide serial numbers, ID and other information, I hate

Today because of the lottery numbers provided to Beaubeau to do SQL files, initially received ZIP file decompression compression was frightened--29 CSV files, each file saved 1000 lottery ID and number-_-! As before, open each CSV file to do a