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Class Origin and metaclass, origin metaclassI. Overview We know that classes can be used as instances to produce objects. How is the class itself produced? Let's trace the origin of the class.Ii. Class Origin 2.1 create a class Class Foo (object):

In the project, there is a need for the product log processing, according to the product log in some fields, the log is divided again. For example, the product log contains the field id,tag=1, now need to put the tag is the base of a file, tag is

Collection module, 1. nametuple -- factory function for creating tuple subclasses with named fields Create a data type similar to the parent database. In addition to being able to access data using indexes, data can be iterated, and data can be

Section 5 clone [5] The object model in PHP5 calls an object through reference, but sometimes you may want to create a copy of the object and expect that the change of the original object will not affect the copy. for this purpose, PHP defines a

After XCode4.0, the compiler is LLVM, and the console debug command prefix is LLDBFirst, LLVM IntroductionLLVM is the framework of the architecture compiler (compiler), written in C + +, to optimize the compile time (compile-time), Link time

By default, the __clone method will establish an object that has the same properties and methods as the original object. If you want to change the default content when cloning, you need to overwrite (attribute or method) in __clone. A cloned method

Address: http://blog.csdn.net/likendsl/article/details/7576549 After xcode4.0, the compiler is replacedLlvm compiler 2.0 More powerful than before:1. llvm compiler is a next-region open source compilation technology. It fully supports C, objective-C,

Python-object-oriented (1)-Basics of opening, python-IntroductionObject-Oriented Programming (Object Oriented Programming, OOP, Object-Oriented Programming)  I. Create classes and objects Object-Oriented programming is a programming method, which

The xcode debugger provides you with a GDB interface, which is an open-source debugger of GNU. You can do anything in the visual interface of xcode. However, if you need it, you can use the gdb command in the command line. Enter the gdb command line

9. Time module:Import timeprint (Time.clock ())   #返回处理器时间, 3.3 started obsolete  ,  changed to Time.process_time () to measure the processor time, Not including sleep time, unstable, print (time.altzone/3600)    #返回与utc时间的时间差 on Mac, print in

subprocess module of the Python standard library series This module allows the spawn processes, connect to their input/output/error pipes, and obtain their return codes. Examples of common methodsCall ()Executes the command and

One, what is a singleton modeSingleton mode: guarantees that a class has only one instance and provides a global access point to access him.A way to implement only one instance of a class:1. Let a global variable make an object accessible, but he

First, static methods (Staticmethod) and class methods (Classmethod)Class method: There is a default parameter CLS, and can be called directly with the class name, you can interact with class properties (that is, you can use class properties)static

A mathematical-defined function and a function in Python Second, why use a function Background summary Three functions and procedures Four function parameters Five local variables and global variables Six forward reference '

In the original: JavaScript that must be knownJavaScript is the front-end prerequisite, and this one of the essence is too much, recently in the review of some things are relatively easy to ignore, here record, on the one hand is to hope that they

In general, the JS language is the façade to the object programming language, the concept of objects almost throughout the whole JS learning.Object　Two ways to create objects: (to generate an object instance you must call the constructor)1. var obj =

By default, the __clone method creates an object that has the same properties and methods as the original object. If you want to change the default content during cloning, you will overwrite (attribute or method) in the __clone. A cloned method can

Base constant False True None notimplemented ellipsis __debug__ site module added constants quitcodenone exitcodenone Copyright license Credits Basic Constants There are only a few constants in the built-in domain name: False [Boolean type] [1] The

Object models in Object PHP5 invoke objects by reference, but sometimes you might want to create a copy of an object and hope that changes to the original object do not affect the copy. For this purpose, PHP defines a special method called __clone.

Many-to-many relationships are simply two tables of data, and each row can correspond to multiple rows of data in another table. Use the example we used in a couple of long. Join us to release the restrictions, the Host table hosts table data can