dataframe initialize

In the past two weeks, in order to complete a job, I have been exposed to the very special two class method in NSObject. What makes them special is that iOS runs ahead of time and automatically calls both methods, and many of the Rules for class methods (such as inheritance, category) are handled differently.And because these two methods are called at the beginning of the program's run, we can use them to do some preprocessing before the class is used. For example, what I came across was to have

ThinkPHP _ initialize method instance analysis, thinkphpu method example This example describes the _ initialize method in thinkPHP. We will share this with you for your reference. The details are as follows: The _ initialize method of the subclass automatically calls the _ initialize method of the parent class. Cons

Class connection and initialization (with a class initialization interview question), initialize the question By loading, connecting, and initializing the Java virtual machine, a Java type can be used by Java programs, as shown in. The connection process consists of three parts: verification, preparation, and resolution. The parsing process of the central classification can be postponed until the program uses a symbolic reference.The parsing process c

Initialize the switch with a MacBook configurationXiao Wang is a system integrator of equipment installation engineers, daily work often to install, debug a variety of industrial computers and switches, on weekdays accompanied by an antique-grade IBM T23 notebook, upgrading hardware can be still heavy and slow, installation is windowsxp system. Keep it for the reason only a more comprehensive interface, has not been willing to eliminate.650) this.widt

Reason:Is that the virtual machine service is not turned onWorkaround: (Run as Administrator)Click "Start → run", enter CMD in the Run box to open a command prompt, then execute the following command in turn.net start VMCInet start vmx86net start Vmnetuserifsc config Vmci=autosc config Vmx86=autosc config Vmnetuserif=autoVMware cannot open the kernel device "\\.\global\vmx86": the system cannot find the file specified. Have you rebooted after installing VMware Workstation? Failed to

Public static　　 Initialize bean to spring

Original: Initializing a multidimensional array"C and Pointers" chapter 8th programming exercises 1th:1 /*2 * * Initializes an array whose specific position is initialized to a specific value3 */4 5 StaticUnsignedCharchar_value[3][6][4][5] = {6{//07{//0,08{0}//0,0,09 }Ten }, One{//1 A{//1,0 -{0}//1,0,0 - }, the{// the -{0},//1,1,0 -{0,' '}//1,1,1 - }, +{// the -{0},//1,2,0 +{0},//1,2,1 A{0,0,0,'A'},//1,2,2 at{0,0,0,0,'x'}// the - }, -{//1,3 -{0},//1,3,0 -{0},/

); Pstlisttmp = (struct stlistuse *) malloc (sizeof (struct stlistuse)); /* Print List */printf ("*********************************************\n"); List_for_each (tmp, list_use_head) {pstlisttmp = List_entry (tmp, struct stlistuse, list); printf ("index:%d, name:%s\n", Pstlisttmp->index, Pstlisttmp->name); } printf ("*********************************************\n"); return 0;}Execution Result:[Email protected]:/mnt/shared/kernelbox/list#./listuseEnter Listus

;}[/code]Output Result:44444This time, the static variable was initialized 5 times with 5 cycles. You must be very surprised, in fact, we are not difficult to infer, in factstatic variables are recorded by a 32-bit memory bit behind a static variable to identify whether the static variable has been initialized. and our p++;*p = 0, but each time the value is assigned to 0, so the program has always been that N1 has not been initialized, and each time initialized. Looking at the memory, it's even

sources.list Sources.list.baksudo vi sources.list (to have Administrator privileges)3) Delete the other contents of the source.list, any choice of the content of a source copy paste into, save, for example, choose Ali Source4) Update aptsudo apt-get update4. SSHThe main implementation of Xshell connection to the virtual machine, while setting up boot from1) Install Ssh-server servicesudo apt-get install Openssh-server2) VerificationPs-e | grep sshIf only ssh-agent that Ssh-server has not starte

.__init__ (XXX)4, There is also a way to use the adorner, if you follow this method will not perform multiple init#Coding=utf8 fromFunctoolsImportWrapsdefSingleton (CLS):PrintCLS Instances={} @wraps (CLS)defgetinstance (*args, * *kw):ifCls not inchInstances:instances[cls]= CLS (*args, * *kw)returnInstances[cls]returnGetinstance@singletonclassMyClass (object): a= 1M1=MyClass () M2=MyClass ()PrintM1 isM2The Python singleton mode is controlled to initialize