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Writing compatible python2.x and 3.x code When we're in the middle of a transition from Python 2.x to Python 3.x, you might want to be able to run in Python 2 and 3 at the same time without modifying any code. This may seem like a reasonable claim, but how do you start? What Python 2 code is easy to do when the 3.

X-Cart study notes (1) understand and install X-Cart. Directory X-Cart study notes (1) understanding and installing X-CartX-Cart study notes (2) X-Cart framework 1X-Cart study notes (3) x-Cart framework 2X-Cart study notes (4) com

Directory X-cart Learning Notes (i) Understanding and installing X-cart X-cart Study Notes (ii) X-CART framework 1 X-cart Study Notes (iii) X-CART Framework 2 X-cart Study Notes (iv) co

3??. of Python Version 0, often referred to as Python3000, or simply py3k. This is a large upgrade relative to earlier versions of Python.In order not to bring in too much of a burden, Python3.0 in the design of the time did not consider the downward compatibility. Many of the programs designed for early Python versions are not performing properly on Python 3.0. To take care of the existing program, Python 2.6, as a transitional version, basically uses the syntax and library of Python 2.

There is an assignment mechanism in Python that assigns values in this way, and the objects on both sides of the equal sign are tuples and the parentheses of the tuples are optional. The usual form is' A String 'Equal to (x, y, Z) = (1, 2, 'a string')The most frequently used environment for this type of assignment is variable exchange, which is shaped likeX, y = y, XThis exchange method does not require an intermediate variable to exchange the values

Through the code porting the error to comb!1. The difference between print functionsIn Python 2.x, you can add spaces or parentheses, but Python 3.x can only be parentheses.# python 2.x>>> print "processing ..." processing...>>> print ("Processing ...") processing...# python 3.x>>> print ("Processing ...") processing .

CakePHP2.x is upgraded to 3.0, and cakephp2.x is upgraded to 3.0. CakePHP2.x upgrade 3.0, cakephp2.x upgrade 3.0CakePHP2.x3.x upgrade shoushunyi, Controller Layer 1. find (list) original 2. in x, this method uses fields in the spe

Openlayers 2.x load map, openlayers2.x Overview: In the previous section, we talked about how Arcgis for js loads a map of heaven and earth, how to load a map of heaven and earth in Openlayers 2. X, and how to add your own wms service. Effect: Map Images Terrain Remove local wms Implementation: 1. Map World Service On the official website of map, we can see

1. PerformancePY3.0 runs Pystone benchmark slower than Py2.5 by 30%. Guido that Py3.0 has great space for optimization, and can be used in string and shaping operations.To achieve a good result of optimization.Py3.1 performance is 15% slower than Py2.5, and there's a lot of room for improvement.2. Encodingpy3.x source files use utf-8 encoding by default, which makes the following code legal:>>> Chinese = ' China '>>>print (China)China3. Syntax1) remov

There are two methods to deal with the problem of numerical calculation: 1, the method of binary decomposition based on divide-and-conquer method, 2, the dichotomy method based on minus two method. Refer to Code Ganker.A method of binary decomposition based on divide-and-conquer methodClass Solution { Public:Double Mypow(DoubleXintN) {BOOLIsnegative =false;if(n%2==1 x 0) Isnegative =true; x = ABS (

1. PerformancePY3.0 runs Pystone benchmark slower than Py2.5 by 30%. Guido that Py3.0 has great space for optimization, and can be used in string and shaping operations.To achieve a good result of optimization.Py3.1 performance is 15% slower than Py2.5, and there's a lot of room for improvement.2. Encodingpy3.x source files use utf-8 encoding by default, which makes the following code legal:>>> Chinese = ' China '>>>print (China)China3. Syntax1) remov

1. Performance Py3.0 runs Pystone benchmark slower than Py2.5 by 30%. Guido that Py3.0 has great space for optimization, and can be used in string and shaping operations .to achieve a good result of optimization. Py3.1 performance is 15% slower than Py2.5, and there's a lot of room for improvement. 2. Encodingpy3.x source files use utf-8 encoding by default, which makes the following code legal:>>> chinese = ' China '>>>print (China) China 3. Syntax

Thank you: http://www.cnblogs.com/codingmylife/archive/2010/06/06/1752807.html1. PerformancePY3.0 runs Pystone benchmark slower than Py2.5 by 30%. Guido that Py3.0 has great space for optimization, and can be used in string and shaping operations.To achieve a good result of optimization.Py3.1 performance is 15% slower than Py2.5, and there's a lot of room for improvement.2. Encodingpy3.x source files use utf-8 encoding by default, which makes the foll

Reference article: 1) http://www.oschina.net/question/12_76955 2) http://rudamoura.com/luaonmacosx.html Recently in the development of the game for iOS, my development machine is iPhone5. The LUA language is required in the development of the game project, so I want to use it in myApple MacBook ProThe LUA language interpreter is installed for script debugging. The version of my Mac OS x is 10.8.3. Lua is a lightweight scripting language that is used

Tag: n of X Recently, I have seen a question like this to calculate the Npower of X. I have thought of some solutions and kept a record for future reference. Evaluate the Npower of X, first brute force solution: int exp(int x, int n){ int ret = 1; for(int i = 0; i It is easy to implement. The complexity of the al

One Math.ceil (x)Import Math1, when x is positive, as long as the number of decimal parts of x >0 +1x=5.01Print (Math.ceil (x)) #6x=5.9Print (Maht.ceil (x)) #62. When x is negative, the number of decimal parts isx=-5.9Print (Math.

Question 1: exclusive or exchange of two numbers Suppose X = 2; y = 3. Our goal is (no tooth decay !!) Exchange the values of X and Y; Take advantage of exclusive or particularity: x ^ x = 0 That is, the two identical numbers are 0; Solution: Make x =

How to say, in fact, is required x contains y,x by y sort Compare x and y two arrays, If x is longer than Y, append the extra keys in the x array to the Y array For example: $x = Array (0=> ' a ', 1=> ' B ', 2=> ' C ', 3=> ' d '

This article for Cocos2d-x 3.x full platform (Android,ios) Novice Development Configuration Tutorial Raiders, I hope to help you. Because this article is facing the novice. So some places will be more verbose, please do not take offense. If there is an error in the tutorial, please correct it. If you are having problems configuring your development platform, you are welcome to discuss them.The environment u

The article briefly introduces the Efficiency Analysis of SQL Server deadlock and transactions and RangeS-U, X-X, there is a need for reference. The article briefly introduces the SQL server deadlock and transactions and Range S-U, X-X efficiency analysis, there is a need for reference. The first part indicates that