python global variable in class

Summarize: Internal functions, you can access the global variable internal functions, modify global variables, and the same name, Python will think that it is a local variable called the variable name (such as print sum) before th

method body as staticThe This keyword cannot be used in static methods, and non-static methods cannot be called directly(distinguishes between classes and objects: this represents a reference to the object that called the function, and the static method belongs to the class, not to the object, and the object does not necessarily exist after the static method is successfully loaded).4. Local variables can override member variables (

a local variable is a value stored in the entire class using the same memory Block. The existence of global variables is mainly due to the following reasons: 1, The use of global variables will occupy more memory (because of their lifetime), but in the computer configuration is very high today, this is not a problem,

."\n";};$fun();// 输出 ‘world‘This simply creates a reference to the same name, and does not change the scope of the original external variable $global, which means that the call in another function still needs to be declared or used closures$global = ‘hello‘;$fun = function(){ global $

Android global variable settings, android global variablesBoolean Type Self-writing class package com.barcode.app;public class ExternData{ private static Boolean a = true; public static Boolean getA() { return a; } public static void setA(

only once 3. A static property can only be initialized to a character value or a constant and cannot be used with an expression. Even if the local static variable is defined without an initial value, the system automatically assigns the initial values of 0 (to numeric variables) or null characters (to character variables), and the static variable is initially 0. 4. Consider using static local variables whe

The distinction between class instance variables, class instance methods, and class variables, class methods, and classes in Ruby is subtle, and the usage is quite different. This article discusses their definition and basic use of the scene to ...I. Class instance variables

A. Member variable: A variable written in curly braces of a class declaration is called a member variable (also called a property/instance variable)Member variable cannot leave class le

Town Field Poem:Cheng listens to the Tathagata language, the world name and benefit of Dayton. Be willing to do the Tibetan apostles, the broad show is by Sanfu mention.I would like to do what I learned, to achieve a conscience blog. May all the Yimeimei, reproduce the wisdom of the body.——————————————————————————————————————————CodeDef Test (): var=5 Print (Var) #局部变量var =10print (Var) #全局变量Test () print (VAR) #全局变量 # Because global varia

Original blog, reprint please indicate the source--Zhou Xuewei http://www.cnblogs.com/zxouxuewei/Static is used in two ways: static in process-oriented programming and static in object-oriented programming. The former applies to ordinary variables and functions, and does not involve classes; the latter mainly describes the role of static in classes.I. For static in process designC + + variables can be divided into 6 different scopes according to the different lifecycles of the defined locations: