Python

    program code optimization usually includes: Reduce the size of the code, improve the efficiency of the Code. This allows the program to run faster. Here's a concrete discussion of Python code optimization techniques. Improved algorithm,

Python code in the network when the old errno 10061 error, the root cause or agent problem.The meaning of the error is approximately: 10061 the connection cannot be established because the target host is actively rejecting it. This is typically

Python, as a powerful scripting language, is often used to write a crawler, the following is a Python crawler crawl proxy server.Now crawl http://www.proxy.com.ru proxy Server, where the proxy server more, simpler.The following code can be used

The zlib module in Python is used to compress or decompress data for storage and transmission. It is the basis for other compression tools. Let's take a look at Python's method of compressing and decompressing strings and files using module zlib. If

This week encountered some problems, and then realized that the basic knowledge for a period of time did not consolidate, or have forgotten part, or need to review, here to make a note, record Ex-Continued A simple description of the problem

In the above two articles have been introduced to the Python crawler and MongoDB, then I will crawl down the data into the MongoDB, first to introduce the site we will crawl, Readfree site, this site is very good, We only need to sign in every day

I. Basic CONCEPTS Lookup (searching) is a data element (or record) in a lookup table that is equal to a given value, based on a given value. Lookup table (search table): A collection of data elements (or records) of the same type Keyword (key):

Introduction First of all, what is the regular expression? Regular expressions, also known as formal representations, formal representations, regular expressions, regular expressions, regular representations (English: Regular Expression, often

First, some introduction of network knowledgeThe socket is the network connection endpoint. For example, when your Web browser requests a home page on www.jb51.net, your Web browser creates a socket and commands it to connect to the Www.jb51.net Web

in Python, files, folders (file action function) operations need to involve OS modules and Shutil modules. Get the current working directory, which is the directory path of the current Python script work: OS.GETCWD () Returns all file and

Core code: #!/usr/bin/python #-*-coding:gbk-*-#设置源文件输出格式 import sys import getopt import JSON import createdict import Mycontoxml Import mycontotable def getrsdatatodict (): #获取控制台中输入的参数, and based on parameters find source file get source

Operations on files, folders (file action functions) in python need to involve OS modules and Shutil modules. Get the current working directory, the directory path of the current Python script work: OS.GETCWD () Returns all the file and

Execution time Method 1 Copy Code code as follows: Import datetime StartTime = Datetime.datetime.now () #long Running Endtime = Datetime.datetime.now () Print (endtime-starttime). seconds Method 2 Copy Code code as follows:

Copy Code code as follows: #-*-coding:cp936-*- Import re S1 = ' ADKKDK ' S2 = ' ABC123EFG ' an = Re.search (' ^[a-z]+$ ', S1)If an:print ' S1: ', An.group (), ' all lowercase 'ElsePrint S1, "Not all lowercase!" " an =

Copy Code code as follows: #-*-Coding:utf-8-*- # python3.3.3 Import Sys,time,re,urllib.parse,urllib.request,http.cookiejar,random,math,os.path,hashlib,json,binascii, Threading "" "Cookie" ""Cookie=http.cookiejar.lwpcookiejar ()#cookie.

Brief introduction Scrapy is a rich, quick and easy to use crawler framework underneath Python. With Scrapy can quickly develop a simple reptile, the official given a simple example is sufficient to prove its strong: Rapid development Here's

This is the first I have done the installation NLTK, the installation was successful. At that time, remember to refer to this post: Http://www.tuicool.com/articles/VFf6BzaWherein, NLTK installation, encountered the module was not found, followed by

A deep understanding of variable assignment in Python and a deep understanding of python Preface In Python, the variable name rules, like most other advanced languages, are affected by the C language. In addition, the variable name is case sensitive.

Python automated development-variables, data types and operations, python Data Types I. Variables Variable definition: Variables are used to store infomation to referrenced and manipulated in a computer program. Used to store the intermediate

Python expert path [5] python-based regular expressions and python Regular Expressions Lists the Python-supported regular expression metacharacters and syntaxes: Character point: match any character import rest = 'python'result =