most useful python modules

Python third-party modules install third-party modulesIn Python, the installation of a third-party module is done through the Setuptools tool. Python has two package management tools that encapsulate Setuptools: Easy_install and Pip. Currently, it is recommended to use PIP.If you are using Mac or Linux, install the PIP

interpreter and gives control to the executed program.The OS.SEP variable is used primarily for separators in the system path.Windows system through is "\ \", Linux class system such as Ubuntu separator is "/", and Apple Mac OS system is ":".Iv. OS module Case code DemoSummary:OS module in the system files and directory operations used more, is also our common module, we must master the knowledge, which is a typical Python standard cross-platform mod

In Python, common modules related to time processing are: Time,datetime,calendar (seldom used)First, in Python, there are usually several ways to represent time: Time stamp Formatted time string Tuple (Struct_time) a total of nine elements Ii. definition of severalUTC (coordinated Universal time, world co-ordination) is GMT, world standard T

Time and datetime modules in Python are modules in the temporal contextOne, Time moduleThere are three types of time-performance formats in the Times module:1, timestamp: Timestamp, time stamp represents the offset in seconds from January 1, 1970 00:00:002, Struct_time: Time tuple, a total of nine element groups.3. Format time: Formatting times, formatted structu

There are some built-in data types in Python, such as int, str, list, tuple, dict, and so on. The Python Collections module provides several additional data types based on these built-in data types: Namedtuple, Defaultdict, deque, Counter, ordereddict, etc. Where Defaultdict and namedtuple are two very useful extension types. Defaultdict inherits from Dict,namedt

j in IP: # # #循环列表Myping (j)#################################################Multi-process [each process, has its own memory]Multithreading [Share a piece of memory]Multi-threaded ping host faster than above#!/usr/bin/python#coding: Utf-8Import threadingImport subprocessdef myping (x):M=subprocess.call (' ping-c2%s >/dev/null '%x,shell=true)If m==0:Print '%s is up '%xElsePrint '%s is down '%xip=[' 176.121.205.%s '%i for I in Xrange (1,254)]For-J in I

path into directory and file name two tuples returnedOs.path.dirname (PATH)#returns the directory of path. is actually the first element of Os.path.split (path)Os.path.basename (PATH)#returns the last file name of path. If path ends with a/or \, then a null value is returned. The second element of Os.path.split (path)Os.path.exists (PATH)#Returns true if path exists, false if path does not existOs.path.isabs (PATH)#returns True if path is an absolute pathOs.path.isfile (PATH)#returns True if pa

Python primarily uses the logging module for log processingMany programs have logging requirements, and the log contains information that has a normal program Access log, there may be errors, warnings and other information output, Python's logging module provides a standard log interface,You can store logs in various formats through it, logging logs can be divided into debug (), info (), warning (), error (), critical () 5 levels,Log level:DEBUGINFOWA

Web Crawl Web sites use HTML descriptions, which means that each Web page is a structured document. Sometimes it is useful to get data from it while maintaining its structure. Web sites do not always provide their data in an easy-to-handle format, such as CSV or JSON. This is the time for the web to crawl out. Web crawling is the practice of using a computer program to collect and organize Web page data into the desired format while preserving its s

1.Python built-in modules and third-party modules Built-in modules: Python, after installing Python, has its own library, called Python's built-in library.Built-in modules

a . Regular Expressionsdefinition: A method that has special meaning symbols grouped together to describe a character or string. Embedded in Python, byThe RE module is implemented, compiled into a series of bytecode, executed by the matching engine written by C. 1. Common matching mode 2. Common re-module functions(1). Re.match ()Determines whether the re matches the position of the string at the beginning. Note: This method is not an exact match. Whe

ModuleIn the development of computer programs, as the program code more and more, in a file code will be more and more long, more and more difficult to maintain.In order to write maintainable code, we grouped many functions into separate files so that each file contained relatively few code, and many programming languages used this kind of organization code, in Python, a. py file is called a module.Benefits of using modulesThe greatest benefit of usin

Python common modules-time modulesYun ZhengjieCopyright Notice: Original works, declined reprint! Otherwise, the legal liability will be investigated.I. Initial TIME module1 #! /usr/bin/env python2 #_*_coding:utf-8_*_3 #@author: Yinzhengjie4 #blog:http://www.cnblogs.com/yinzhengjie/tag/python%e8%87%aa%e5%8a%a8%e5%8c%96%e8%bf%90%e7%bb%b4%e4%b9%8b% e8%b7%af/5 #Emai

. 3, Urllib, URLLIB2　　Urllib2 can accept a request object and use this to set the headers of a URL, but urllib only receives one URL.　　This means that you cannot disguise your user-agent string and so on. The Urllib module can provide a method for UrlEncode, which is used to generate a get query string, and URLLIB2 does not have such a function.　　This is why Urllib and urllib2 are often used together. (1) Urllib2.urlopen (Url[,data,timeout]) is used to obtain Web content (2) urllib2. Response (U

article will not repeat." If necessary friends can refer to this article://www.jb51.net/article/107473.htm "After the installation is complete, the following is done, without error, it indicates the installation was successful:? 12 >>> importparamiko>>> SummarizeThe above is the entire content of this article, I hope that the content of this article on everyone's study or work can bring certain help, if there are questions you can message exchange, thank you for

The examples in this article describe the Python creation module and the method of module import. Share to everyone for your reference. The specific analysis is as follows: The Python Learning manual reads: Define modules, just use a text editor, enter some Python code into the text, and then save with a. py suffix n