What does python language do?

Python is a computer programming language. It is an object-oriented dynamic type language that was originally designed for writing automated scripts (shells). With the continuous updates of the version and the addition of new language features, it is increasingly used for the development of independent and large-scale projects.

System programming: Provides API (Application Programming Interface), which can facilitate system maintenance and management. It is one of the iconic languages ​​​​under Linux. First, it is an ideal programming tool for many system administrators. (Recommended learning: Python video tutorial)

Graphics processing: It is supported by graphics libraries such as PIL and Tkinter, which can facilitate graphics processing.

Mathematical processing: NumPy extensions provide extensive interfaces to many standard mathematics libraries.

Text processing: The re module provided by python can support regular expressions, and also provides SGML and XML analysis modules. Many programmers use python to develop XML programs.

Database programming: Programmers can communicate with Microsoft SQL Server, Oracle, Sybase, DB2, MySQL, SQLite and other databases through modules that follow the Python DB-API (Database Application Programming Interface) specification. communication. Python comes with a Gadfly module, which provides a complete SQL environment.

Network programming: Provides rich modules to support socket programming, which can easily and quickly develop distributed applications. Many large-scale software development projects such as Zope, Mnet and BitTorrent. Google are using it extensively.

Web programming: Application development language that supports the latest XML technology.

Multimedia applications: Python's PyOpenGL module encapsulates the "OpenGL application programming interface" and can perform two-dimensional and three-dimensional image processing. The PyGame module can be used to write game software.

Game engine: PYMO stands for python memories off. It is an AVG game engine running on Symbian S60V3, Symbian3, S60V5, Symbian3, and Android systems. Because it is developed based on the python2.0 platform and is suitable for creating AVG games in the style of Memories Off, it is named PYMO.

Hacker programming: Python has a hack library, which has built-in functions that you are familiar with or unfamiliar with, but it lacks a sense of accomplishment.

Write a simple crawler in Python

First, you need to obtain the corresponding HTML source code through the urllib2 Module. (PS: urllib2 can no longer be used after python3.3, and is replaced by urllib)

import urllib2  #调用urllib2  
url='http://www.baidu.com/s?wd=cloga' #把等号右边的网址赋值给url
html=urllib2.urlopen(url).read()   #html随意取名 等号后面的动作是打开源代码页面，并阅读
print html #打印

Through the above three sentences, the source code of the URL can be stored in the content variable, and its type is character type.

The next step is to extract the content we need from this pile of HTML source code. Use Chrome to check the code of the corresponding content (you can also use Firebug in Firefox).

You can see that the url information is stored in the span tag. To obtain the information, you can use regular expressions.

For more Python related technical articles, please visit the Python Tutorial column to learn!

The above is the detailed content of What does python language do?. For more information, please follow other related articles on the PHP Chinese website!