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Original Address https://www.cnblogs.com/JetpropelledSnake/p/8982495.html http://www.runoob.com/python/os-walk.htmlThe Os.walk method is used primarily to traverse subdirectories and sub-files within a directory.Can get a ternary tupple (Dirpath, Dirnames, filenames),The first is the starting path, the second is the folder under the starting path, and the third is the file under the starting path.Dirpath is a string that represents the path to the directory,Dirnames is a list that contains the n

Recursive queries in SQL statements SqlServer2005 and Oracle two versions Before using Oracle, think of its recursive query is very useful, the study of SQL Server, found that it also supports recursive query in SQLTo illustrate:The SqlServer2005 version of SQL is as follows:For example, a table with ID and PID fields, ID is the primary key, PID represents its ancestor node, table structure and data:CREATE TABLE [AAA] ([ID] [int] NULL,[PI

server forbidden-ip 192.168.0.1[Njupt-ip-pool-0] network 192.168.0.0 mask 255.255.255.0[Njupt-ip-pool-0] gateway-list 192.168.0.1[Njupt-ip-pool-0] quit[Njupt] interface Vlanif 1[Njupt-Vlanif1] ip address 192.168.0.1 255.255.255.0[Njupt-Vlanif1] dhcp select global[Njupt-Vlanif1] quit[Njupt] quit [Njupt] mac-authen[Njupt] mac-authen interface GigabitEthernet 0/0/1 to 0/0/24[Njupt] mac-authen username macaddress[Njupt] aaa[Njupt-

Written questions often have running results, and most of the body size is around the scope of expansion, the following summarizes several related questions: The outer variable function can be found inside the variable inside the function (local variable) outside the outer layer is not found. function aaa () { var a = 10;} alert (a); // error A is not defined because a is a local variable defined inside the function, the outer (global enviro

In RangeSet of Guava learning, we talked about the features and usage of RangeSet. There are many differences between RangeMap and RangeSet.On the official API of Google Guava, we can know that RangeMap is a collection type that does not intersection and is not an empty Range (key) map to a Value ). Unlike RangeSet, RangeMap cannot merge adjacent intervals even if the ing value is the same.Like RangeSet, RangeMap is also an interface that implements only two classes, mmutableRangeMap and TreeRan

Tstrings is an abstract class that, in actual development, is the most applied except for the basic type.General usage We all know, now to discuss some of its advanced usage.Let's start by listing several properties to be discussed:1, CommaText2, Delimiter Delimitedtext3, Names Values ValuefromindexLet's look at the first one: CommaText. How to use it? To speak in code:Constconstr:string = ' aaa,bbb,ccc,ddd ';VarStrs:tstrings;I:integer;BeginSTRs: =

undefined11. Prototype ChainPrototype chain: The connection between the instance object and the prototype is called the outermost of the prototype chain: The Object.prototype object invokes the property in the constructor, and it is searched along the prototype chain to the prototype prototype of the object, if not, Find function Aaa () {this.num = 10;//Priority Highest}aaa.prototype.num = 20, along the outermost prototype chain to Object.prototype;

The use of Delphi tstringlistTstrings is an abstract class that, in actual development, is the most applied except for the basic type.Tstringlist Common Methods and properties:VarList:tstringlist;I:integer;BeginList: = tstringlist.create;List.add (' Strings1 '); AddList.add (' Strings2 ');List.exchange (0,1); ReplacementList.insert (0, ' Strings3 '); InsertI: = List.indexof (' Strings1 '); {The first occurrence of a position}List.sort; Sortlist.sorted: = True; {Specify sort}List.count; TotalList

/dev/sr0 is write-protected, mounting read-only[Email protected] ~]# cd/etc/yum.repos.d/[[email protected] yum.repos.d]# mkdir AAA[Email protected] yum.repos.d]# MV *.repo aaa/[email protected] yum.repos.d]# CP Aaa/centos-media.repo.[[email protected] yum.repos.d]# lsAAA Centos-media.repo[Email protected] yum.repos.d]# VI Centos-media.repo... The above contents a

① Configuring the console login password　　The first way to configure authentication (AAA)[Server] AAA (authentication mode)[SERVER-AAA] local-user admin1234 password irreversible-cipher (irreversible password) [email protected] (local user admin1234 password)[SERVER-AAA] Local-user admin1234 Privilege level 15 (local u

deleted.After introducing the methods for registering information in the registry, a program will be used to explain their specific usage in the program. Two Programming and operating environment and the work to be prepared:I > Windows System 2000 Server Edition II >.. Net FrameWork SDK Beta version 2 III >. Because the function of the program is to delete the specified primary key, subkey, and key values, this requires that we first set the location and name of the values in the registry. Spec

Native usageAPIs for direct use_.rejectRemoves an element based on the condition.var foo = [ {id: 0, name: "aaa", age: 33}, {id: 1, name: "bbb", age: 25}]var bar = _.reject(foo, [‘id‘, 0])//bar = [{id: 1, name: "bbb", age: 25}]_.pickFilters the value in the first parameter and returns the array based on the key of the second parametervar foo = {id: 0, name: "aaa", age: 33}var bar = _.pick(foo, [‘name‘, ‘

Entry Point of NGN access control security -- Diameter protocol and its application in the SIP network environment Xie Wei I. Introduction The diameter series protocol is a new generation of AAA technology, which is gaining more and more attention due to its powerful scalability and security assurance. In international standards organizations such as ITU, 3GPP and PP2, DIAM-ETER protocols have been officially used as the preferred

providerhost smtp.provider.example# A 126 emaliaccount 126host smtp.126.comport 25from aaa@126.comauth logintls offuser aaa@126.compassword passwordlogfile ~/.msmtp.log# Set a default accountaccount default : 126 Configure the. msmtprc permission. The following settings only give the. msmtprc user the read and write permissions. Others do not have any per

of my mvvm framework aveon V3 are knouckoutjs and rivetsjs. Get its two-way dependency chain architecture from knouckoutjs, and go through two versions from learning to digestion. The implementation of V2 is completely original. Get its declarative binding API design from rivetsjs, but its implementation is completely self-built. V3 makes some improvements to V2's two-way dependency chain architecture, as long as it is renamed, making these concepts more acceptable. Structure of the two-way b

the file.Sed-e '1 {$ q;} '-e' $! {H; d;} '-e x # This row is displayed when there is only one row in the file.Sed-e '1 {$ d;} '-e' $! {H; d;} '-e x # when there is only one row in the file, no output# Only display rows matching Regular Expressions (simulate "grep ")Sed-n'/regexp/P' # method 1Sed '/regexp /! D' # method 2# Show only the rows that do not match the regular expression (simulate "grep-v ")Sed-n'/regexp /! P' # method 1, which corresponds to the preceding commandSed '/regexp/d' # met

. parameter specifies whether an empty array element is returned. String.Split (char[], Int32, stringsplitoptions) Returns a string array containing the substrings in this string, separated by the elements of the specified Char array. parameter specifies the maximum number of substrings to return, and whether to return an empty array element. String.Split (string[], Int32, stringsplitoptions) Returns a string array containing the substrings in this string, s

platform. Win-> ' NT '; Linux-> ' POSIX ' (os.system) ("Bash command") Run the shell command to display directly Import OS Print (Os.system ("Ping www.baidu.com")) Os.environ Get system environment variable (OS.PATH.ABSPATH) (path) Returns the absolute path normalized by path Import OS Print (Os.path.abspath (' hellow.py ')) () Os.path.split (path) Partition path into directory and file name two tuples returned, does not determine whethe

default with Repeatable_read isolation levelOracle default with read_commited isolation level2.4. Transactiondefinition defines the propagation behavior of the transaction (isolation, propagation, timeout, read-only) 1. What is the propagation (propagation) behavior of a transaction?The propagation behavior of the transaction is mainly used to solve some problems,A complex situation arises: call SERVICE1.AAA () and SERVICE2.BBB () to complete a busin

constructor above is written as Cclass (const cclass* c_class), it will not work. In fact, all other passes are values, except that the pass-through reference is not a passing value.Start with a small example: Test yourself to see what the output of this program is? ） Copy Code code as follows: #include using namespace Std; Class Cexample { Private int m_ntest; Public Cexample (int x): m_ntest (x)//with parameter constructors { cout } Copy constructors, const in parameters a