Python

　　Before learning Python, there have been a series of Python exception handling articles, not simple enough and incomplete, so decided to tidy up an article, to do a supplement.Http://www.cnblogs.com/cmt110/p/7464748.htmlPython shell >>> Open ( '

Installation dependency: Pip install watchdog#!/usr/bin/env Python3#-*-coding:utf-8-*-ImportLoggingImportOSImportThreading fromConfigparserImportConfigparser, Nooptionerror fromWatchdog.eventsImportFileSystemEventHandler

the RE module contains a pair of regular expressions. The main features and regular expressions of the RE module are described in this chapter. What is a regular expressionRegular expressions are patterns that can match text fragments. The simplest

This section uses SQLite to understand database operations-------------------------Database supportUsing simple plain text can only implement a fallback function, the need to introduce a database to complete more powerful functions, this section

One: Introduction to IO ModelWhat is the difference between synchronous (synchronous) IO and asynchronous (asynchronous) Io, what is blocking (blocking) IO and non-blocking (non-blocking) IO respectively? The problem is that different people may

############################################# #socket单线程Server side:#!/usr/bin/env pythonImport Socket,time,osHost= "port=18000S=socket.socket (Socket.af_inet,socket. SOCK_STREAM)S.bind ((Host,port))S.listen (1)While 1:Conn,addr=s.accept ()print '

1 #Coding=utf-82 fromSeleniumImportWebdriver3 #From selenium.common.exceptions import nosuchelementexception4 ImportUnittest,os,time5 6Source=open ("F:\\script\\py_scripts\\login_parameter\\username.txt","R")#User name File7UN = source.read ()#Read

---restore content starts---1, in the computer memory, the unified use of Unicode encoding, when the need to save to the hard disk or need to transfer, the conversion to UTF-8 encoding.When editing with Notepad, the UTF-8 characters read from the

String Basic operationAll standard sequence operations (indexes, shards, multiplication, judging membership, seeking length, taking minimum and maximum values) also apply to strings, which are already described in the previous steps. However, be

Python concurrent programming Multi-processI. What is a processProcess: a process in progress or a task that performs a task is the CPU.Principle: Single-core plus multi-channel technologyIi. the difference between process and procedureProcess

1, by this problem toss a morning finally solved, and then online to see useful string.replace (U ' \xa0 ', U ') replaced with a space, the method tried useless.Later found to be in open when add utf-8 to solve the problem.Think this is all right,

meta-Class (Metaclasses)The meta-class provides an effective way to change the behavior of Python classes.The definition of a meta-class is "class of a class". Any instance is its own class, which is a meta-class.class demo: pass obj = Demo () print

ProcessProcess definition: The process in progress is an abstraction of the running program.1.multiprocessing Module IntroductionMultithreading in Python does not take advantage of multicore advantages, and if you want to fully use the resources of

for a list, for example [1,2,2,2,2,3,3,3,4,4,4,4], now I want to count the duplicates in this table and repeat them several times. EG1:mylist = [1,2,2,2,2,3,3,3,4,4,4,4]MySet = set (MyList) #myset是另外一个列表 with no duplicates inside MyListFor item in

I. Sign-in casesA. Find Autohome news title link picture Write LocalImport Requests fromBS4 Import Beautifulsoupimport uuidresponse= requests.Get( 'http://www.autohome.com.cn/news/') response.encoding='GBK'Soup= BeautifulSoup (Response.text,'Html.

Python 3 Concurrent Programming Multi-process process synchronization (lock)Data sharing between processes, but sharing the same file system, so access to the same file, or the same print terminal, there is no problem, the result of competition is

1. Examples of adorners with parametersdef decorator (Arg1, arg2): def real_decorator (func): def wrapper (*args, **kwargs): print ("You decorated a function that does something with%s and%s "% (Arg1, arg2)) func

After the completion of the harem problem (eight queen problem), and the use of a half-day time to complete the famous "Look at the--KMP" algorithm. This is definitely a big hole for beginners, it's very difficult to understand.In this, to the

1, if Judging conditions can also be abbreviated X. As long as a non- x 0 value, a non-empty string, a non-empty list, etc., it is judged True , otherwise False .2. This is because the input() returned data type is str str not directly compared to

Python reads the timestamp in the PE file (exe/dll, Original Code address: Https://www.snip2code.com/Snippet/144008/Read-the-PE-Timestamp-from-a-Windows-Exe Https://gist.github.com/03152ba1a148d9475e81   Go directly to the code and reference it to