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The iterator was not invented by Ruby. It is widely used in all kinds of object-oriented languages. In Lisp, it's just not called that. However, the concept of iterators is not familiar to many people, so we will do a more detailed description here.

PHP5.5 introduces the concept of an iterative generator, the concept of iteration is already in PHP, but the iterative generator is a new feature of PHP, similar to the iterative generator in Python3, to see how the PHP5.5 Iteration Builder is

1. Inner class is divided into member inner class, Static nested class, Method inner class, anonymous inner class. The commonality of several inner classes: A, the inner class is still a separate class, after compiling the inner class will be

Summary of new features and features for each version of PHP5Because PHP that "set hundred of the length" of the egg pain grammar, coupled with the community atmosphere is not good, many people on the new version, new features are not interested.

Go has a strong C background, in addition to the inheritance of grammar, its designers and its design goals are inextricably linked to C language. Go is a powerful support for go and C language Interoperability (interoperability). Especially if you

Strings>>> s = ' Django is cool ' >>> words = S.split () >>> words[' Django ', ' is ', ' cool ']>>> '. Join (words) ' Django is cool ' >>> s.count (' o ') 3>>> s.find (' Go ') 4>>> s.replace (' Django ', ' Python ') ' Python is cool 'Some of the

1. Error handlingUse try except finallyTry : = 10/0except zerodivisionerror, E: print"zerodivisionerror ", Efinally: print"finally "or modulo by zerofinallyError type (with

anonymous functions /Anonymous functionAn anonymous function is a function that does not require a binding function name (i.e. functions, which is not bound to a name). Anonymous functions are built with lambda expressions. Often used to quickly

First of all, I said it was a tragedy, before I saw the programmer's ego-link, load and library. C has strong symbols, weak symbols, strong references, and weak references. When I saw the 3.5.5 Weak signs and strong symbols, I feel a little confused,

Previously used in Windows Idel with the function of debugging a Python program, under Linux has not been debugged. (Most of the time just print) look up the Internet Method: Copy Code code as follows: PYTHON-M PDB a.py a.py

Python has two built-in modules to handle command-line arguments, one is getopt, and the Deep inPython is also mentioned in the book, can only handle command-line parameters, the other is Optparse, it is powerful, and easy to use, can easily

The typeof in JavaScript is actually very complex, it can be used to do a lot of things, but at the same time there are a lot of weird performance. This article enumerates several usages of it, and also points out the existing problems and solutions.

Most of the things we learn are elements that are not related to a particular programming language, but I'm mostly focused on JavaScript, and some C. Let's start with a simple C program that reads a song and a band name and then outputs them to the

Collated the input and output of the files in Python and mainly describes the operation of the file system in some OS modules.File input and output 1, built-in function open(file_name，文件打开模式，通用换行符支持) , open file return file object. 2, when the open

cve-2012-5613 is a vulnerability where file permissions write trigger TRG store files (that is, forged trigger), which are triggered by root to elevate privilege. Do not know why this loophole has not been repaired, probably MySQL think this is a

In general, for a request, the server parses it to determine the legitimacy of the request and the path to travel. This section explains how to obtain the requested data. (reprint please indicate CSDN blog for breaksoftware)We created a handler

Macro definition containing if When the macro definition contains if1) define the following macro# Define DC (p) if (FOO (p) Fun (P)Used in the following EnvironmentIf (k> N)DC (k );ElseDC (N );After macro replacementIf (k> N)If (FOO (k ))Fun (k )

Describes the basic use of the log system (logging facility) in Ace.   I. IntroductionI have previously introduced an open-source log system log4cplus, and ACE also has its own logging facility, similar to log4cplus. Ace Log SystemIt also features

Http://forums.codeguru.com/showthread.php? 315371-visual-c-debugging-how-to-use-assert-and-deal-with-assertions-failures Q:What is an assertion? A:An assertion statement specifies a condition that you have CT to hold true at some particle

Address: http://blog.csdn.net/ariesjzj/article/details/7881049 One of the difficulties in Porting a project's build system from GCC to msvc is that the source code uses GCC extension (http://gcc.gnu.org/onlinedocs/gcc/C-Extensions.html), which can