Python

#!/usr/bin/env python#-*-coding:utf-8-*-#__author__ = "Xiaotie"#Email: [Email protected]" "Binary calculation operator Value 8 4 2 1 0 0 0 0 0 0 0 0 0A 50 0 0 1 1 0 0 1 0B 0 0 0 0 1 0 1 0>> (left) For example 10 shift left 1 bits and 1 0 divided by 2

Search and replace in a string:S.find (substr, [Start, [end]]) #返回S中出现substr的第一个字母的标号, returns 1 if there is no substr in S. Start and End function is equivalent to searching in s[start:end]S.index (substr, [Start, [end]]) is the same #与find (), but

1. Procedure Design principle: SolipSolip Design Principles1. Single responsibility principle (SRP)An object pair should only be responsible for one element2. Open closure principle (OCP)Open for extension, modify closed3. The Richter Replacement

System Basic Information ModulePsutil Module https://pypi.python.org/pypi/psutil/System Performance Section1.CPU InfoPsutil.cpu_times () # get full CPU information Note: Different versions display different contentincludes:User # Users account for

PYTHON:CENTOS6 Default version 2.6, compile and install is a good choice if you want to get a higher version1, custom installation, do not need to deliberately directly set up a directory or file deletion can.2, yum installation because of

I. Producer / consumer modelConcept: The producer generates a piece of data and puts it in buffer , while the consumer pulls and consumes the data from the bufferUnderstanding : Like in the life of manufacturers to produce products, customers buy

Import module:Import CopyDepth copy:# Shallow copy: Copies only top-level objects, or: Parent objects # deep Copy: Copies all objects, top-level objects, and their nested objects. Or, the parent object and its child objectsCases:>>> D =

You can sort by using the Sort method of the list, where two parameters are used to indicate how the sort is sorted, code:inch[7]: a =[' X11 ', ' abc323 ', ' E26 ', ' 112ddd ']inch[8]: A.sort (Key=len, reverse=True)inch[9]: aout[9]: [' abc323 ', ' 11

No parameter AdornerFor Python little white, Python's decorator is simply confusing, not knowing how to understand, in fact, according to the literal meaning of the adorner,is to decorate the function you have defined, and then return a new function

~$ sudo apt-GetInstall python-Pip is reading the package list ... Completing the dependency tree that is analyzing the package is reading state information ... Complete Python-The Pip is already the latest version. Upgraded the0A new package, a

Original: http://blog.csdn.net/zhaokuo719/article/details/8209496Installing lxml python in a Windows environment1, first of all to ensure that your Python environment installation perfect2. Download the http://peak.telecommunity.com/dist/ez_setup.py

Because the operands of the read and write methods of Python are all string. When the binary is manipulated, the string is converted to a list for parsing, and when the file is re-written, it is converted to string.>>> Import String>>> str = ' ABCDE

1. CentOS6.5 install Python's dependency packageYum Groupinstall "Development tools" Yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline -devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel2, download the

Python Development Lightweight Crawler (IMOOC summary 04--url Manager)介绍抓取URL管理器 url管理器用来管理待抓取url集合和已抓取url集合。这里有一个问题，遇到一个url，我们就抓取它的内容，为什么还要对url进行管理呢？

>>> x = 100>>> y = 10>>> x 10>>> x if x > y else y100If statement:>>> x = 10>>> if x = = 10:... print (x)...10>>> if x = = 10:... print (x).. else:... print ("X not 10!")...10>>> if x = = 10:... print (x)... elif x = = 100:... print (x).. else:...

Capitalize () change the first character of a string to uppercaseCasefold () Change all characters of the entire string to lowercaseCenter (width) centers The string and fills the new string with a space of length widthCount (sub[, start[, end]) The

#代码是在3.5 of the interpreter running under theA = ["my", "name", "is", "XXX"]#以 (Index,value) in the form of a line printFor index in range (Len (a)): #遍历索引下标 Print (Index,a[index]) #同时输出索引, and the value of the variable#输出结果:#0 my#1 Name#2

1 ImportWin32clipboard as W2 ImportWin32con3 4BASE_ADDR = 0x8e000005Buffer_len = 0x1236 7 defGetText ():8 W.openclipboard ()9D =W.getclipboarddata (Win32con. CF_TEXT)Ten W.closeclipboard () One returnD A - defSetText (astring): -

Yesterday before work to write a section of the back-end program, and then run, found that the Web page open speed is a bit slow, not too ideal (because to go to the background database to do a lot of data query, but also to do the operation, so the

Requirements:1, after entering the salary, provide a variety of items for Selection.2, There are items menu and price.3. Select whether the user can pay for the product Calculation.4. Print the items purchased by the User.5, the output of the User's