Python

First, class definition: Copy Code code as follows: Class class, you can use its properties, and in fact, after you create a class, you can access its properties through the class name. If you modify its properties directly

(1) variable = A If exper else b(2) variable = (Exper and [b] or [C]) [0](2) variable = exper and B or C The above three uses all can achieve the goal, like C language variable = exper? B:C: If the value of the Exper expression is true then

Read and write filesFirst Look at an example: f = open (' Thefile.txt ', ' W ') #以写方式打开, try: f.write (' Wokao ') finally: f.close () How files are opened: f = open (' file ', ' mode ') ' R ': Read-only (default). If the

Parse pathpath resolution relies on some of the variables defined in the OS: os.sep-the separator between the parts of the path. os.extsep-the delimiter between the filename and the file name extension. The os.pardir-path represents a

Copy ()chutil.copy (source, destination)The Shutil.copy () function implements the file copy function, copying the source file into the destination folder, and two parameters are in string format. If destination is a file name, it is used as the

Bitwise operators are calculated by taking a number as a binary. The bitwise algorithms in Python are as follows: Bitwise AND (Bitwise AND of x and Y) & Example: 5&3 = 1 Explanation: 101 11 The same bit is only single-digit 1, so the result is 1

See examples directly: Copy Code code as follows: #!/usr/bin/python #-*-Coding:utf-8-*- From BS4 import BeautifulSoup Html_doc = "" " the Dormouse ' s story the dormouse ' s story once upon a time there were three little; and

1.1 Os.system (command)Runs the command command in a child shell and returns the exit state after the command command has finished executing. This is actually implemented using the C standard library function system (). This function needs to reopen

About the python2.x and 3.x to bring the print does not wrap the problem: Yesterday had a push text, using the end = definition, to solve the small horizontal problem, but because of the screen display problem, if the string length is too large, it

1. IteratorThe simplest example of a iterator should be an array subscript, and look at the following C + + code: Copy Code code as follows: int array[10]; for (int i = 0; i printf ("%d", array[i]); The iterator works in

Classes and instancesA class is associated with an instance: A class is the definition of an object, and an instance is a "real object" that holds the specific information of the object defined in the class. The following example shows how to

I was planning to develop a fun project last month, but there was no time. This is part of the project, Deal with this part of the basic still poor communication. First analog mouse keyboard press release action, I use X11 This library, so to

Copy Code code as follows: #! /usr/bin/python2.7 #--Coding:utf-8-- Import OS, urllib,urllib2, thread,threadingImport re #匹配音乐urlReg=re.compile (' {' Name ': ' (. +?) '. +?" Rawurl ":" (. +?) ",. +?} ', Re. I) Class Downloader

Copy Code code as follows: #!/usr/bin/env python #coding: Utf-8 Import Re,sys Import Urllib From BS4 import BeautifulSoup Global R_url Def hq_url ():     so_url = "http://movie.douban.com/subject_search?search_text="      data =

Linux server has CentOS, fedora and so on, all pre-installed Python, version ranging from 2.4 to 2.5, and Windows type of server is mostly installed Python, so as long as the local write a script, upload to the corresponding machine, at run time

Copy Code code as follows: #!/usr/bin/python #coding: Utf-8 #write: JACK #info: FTP Example Import ftplib, socket, OS From time to import sleep, CTime def loginftp (self):FTPs = Ftplib. FTP ()Ftps.connect

Log files are usually generated by day, then replace the monitored log files by judging the file's date of production and the current time in the programThe program is just a simple example, monitor test1.log 10 seconds, turn to monitor Test2.log

The three-mesh operator is the ternary operator The ternary expressions of some languages (such as Java) are as follows: A result when a condition is true: the result of a false decision Result=x if X Python's ternary expression has the

1, to the space and special symbols Copy Code code as follows: S.strip (). Lstrip (). Rstrip (', ') 2. Copy String Copy Code code as follows: #strcpy (SSTR1,SSTR2) SSTR1 = ' strcpy ' SSTR2 = SStr1 SSTR1 = '

1. Notepad can set-preferences-language-tab to spaces2. Editor recommended Sublime3. Data type:3.1 If there are many characters in the string that need to be escaped, you need to add a lot \ , in order to simplify, Python also allows r‘‘ ‘‘ the