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class of object, which object calls this function, this represents which objectfinal:1. Modifier classes, variables (member variables, static variables, local variables), functions2. The modified class can not be inherited; 3. Modified functions cannot be overwritten4. The modified variable is a constant and can only be assigned oncePolymorphic class Invocation: Member variable look to the left, function see which class is actually instantiated on the rightNote: When the throw is present alone,

")Age_of_penny=23Age=int (Input ("age") # Forced conversion type, input default type is a string character type, forced to convert to int type;If age_of_penny==age: # note = the difference between = = = Pay special attention toPrint ("You thinking are right")Elif Age_of_penny Print ("Thinking smaller ...")ElsePrint ("Thinking bigger ...")(2) while and While-elseAge_of_penny=23Count=0While Countage = Int (input ("age"))If Age_of_penny==age:Print ("You thinking are right")BreakElif Age_of_penny Pr

, the function is not an isolated function, even the surrounding variable environment, forming a closed environment package, common return .In a nutshell: The scope of a function depends on the declaration, not on when it is called ."Example 2"1 functionprev () {2 varLeg = "Alexis";3 varArsenal_leg =function(){4 returnleg;5 } 6 returnArsenal_leg;//Arsenal's thigh was Sanchez in the first half of the season.7 }

" #[改]----- 将刘备 替换 为周瑜print(names) # names.remove("Masu") # [删]-----删除 马谡 (有三种常用的方法)# del names[-3]print(names.pop(-3))print(names)(3) List of check, statisticsNames.index (); Names.count ()names=["Zhangfei","Guanyu","Liubie","Zhaoyun","Machoa","Jiangwei","Masu","Zhaoyun"]print(names)print(names.index("Zhaoyun")) # 获取下标，赵云有俩个但是却只查到了列表里的第一个？？？？print(names[names.index("Zhaoyun")])print(names.count("Zhaoyun") ) # 统计 列表中赵云的个数(4) List reversal, sorting, mergingNames

='dtntr' ) 2. Using a self-junction SELECT p1.prod_id, P1.prod_name from as as P2 WHERE = p2.vend_id and = ' dtntr ' 7--external coupling In the example above, the junction contains rows that have no associated rows in the related table, and this type of join is called an outer junction. Retrieving all customers and their orders 1. Use inner coupling SELECT cust_name, Order_num from as INNER JOIN as o on = o.cust_id Customers without orders ar

returnCount7 8 PrintVowles_count ('Hello world!') String index (indexed) Each character in the string is indexed with an index value (subscript) Index starts at 0 (forward) or-1 (backwards)1str ='Hello World'2 3 PrintStr[2]4 PrintStr[-3]5 PrintStr[15]6 7 L8 R9 Traceback (most recent):TenFile"", Line 1,inch OneFile"C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize

', methods=[' GET ']) deftest (): token=request.args.get (' Token ') ifverify_token (token) ==1: return ' Data ' else: return ' ERROR ' if__name__== ' __main__ ': app.run (debug=true) Written by: Request_py:#!/usr/bin/env python#-*-coding:utf-8-*-import requests# r = requests.get (' Http://127.0.0.1:5000/login ', auth= (' ZX '), ' Thystar ') # print r.text# First run the above code to get token, then copy the taken value, run the following code # eac

, and can point to multiple different objects in the lifetime of a pointer, without assigning a value at the time of definitionB. The reference to the pointer is obtained by referring to the object, so the pointer must be valid at this pointC. nullptr used to initialize pointers, he is a special type of literal valueNULL can also be used to initialize pointers, but he is a preprocessing variable defined in CstdlibD. The reference is exclusive, the pointer is a flower-heartE. assignment forever c

When using the YCM plugin in vim, it occasionally appears:"Unicodeencodeerror: ' ASCII ' codec can ' t encode characters in position 2-5: Ordin al not in range (128)"Self-Baidu, found that the hint and Python, Lenovo to ycm rely on Python, so try:Insert the following code at the beginning of the/etc/python2.x/sitecustomize.py file:Import sysreload (SYS) sys.setdefaultencoding ('utf-8')Note: The Python study

propertya:visited link address has been visitedA:active Activated by userA:hover Mouse Hover2) other Pseudo-class: Focus when you get focusedFor example, by changing the color of the text box to indicate the location to be entered (when the line text box, password box, or multiline Input:focus {}:: Selection to be selected must be two:For example:p::selection {color:red;}Pseudo elements:: First-letter: Fist-line: Before add content before the specified elementP.tip {content: "Hot Tip"}: After t

What is received in the function if we pass an array to the parameter through the parameters of the function? We know that if a normal variable is passed, then the parameter receives a value, and if a pointer variable is passed, the value is also received by the parameter, except that the value is the address. So what is an array? Pass the array as a value to a function, and in the parameters of the function there is an array variable to receive the array and see what the array variable is recei

.Application Features Scala offers a feature, Scala. Application, you can save some of your finger input work. The way to use this trait is to first write "extends application" behind your singleton object name. Then instead of the main method, you can put the code that you want to put in the main method directly between the braces of the singleton object. It's so simple. You can then compile and run as you would for other programs. Import Checksumaccumulator.calculate Object Demo extends Applic

IOS: learning notes, Swift through Boolean (translated from: https://developer.apple.com/swift/blog/ Aug 5, 2014 Boolean)View Swift through Boolean A simple Bool type contains many major Swift functions. It is an interesting demonstration of how to build a simple type. this article will create a new MyBool type that is very similar to the Bool type in design and implementation. we hope that by designing and

. Parameters (1) When the function accepts parameters, you must specify the following content: A. In its definition, the function specifies the list of accepted parameters, and the type of these parameters; B. List of parameters matched in each function call. C. There can be any number of parameters. Each parameter has a type and a name. The parameters are separated by commas. Each parameter is used as a variable in the function code. (2) A demo Namespace Exercise { Class Program { Sta

Insist ~ insist ~ insist ~! Talk smack about someone Speak ill of others. I heard you were talking smack on me to my friends. Why would your say something bad about me? I heard that you spoke ill of me to my friend, why do you speak ill of me? Talk behind someone ' s back Say someone behind your back To vent to someone complain to others I didn ' t mean to talk behind your back. But your were kin

= = ' Admin ' $password= = ' Admin '){ Echo' Login Chen Gong ';}Else{ //the time and IP address when the administrator attempts to log on to the system with what password $date=Date("Y-m-d h:i:s", Time()); $ip=$_server[' REMOTE_ADDR ']; $message= "User {$usernameIn$dateTo$passwordTry to log on to the system, the current user's IP address is {$ip}"; Error_log($message); //Jump Header(' location:login.html ');}Open: D:\wamp\logs\login.log:[19-may-2015 16:25:59 UTC] User Dee at 2015-05-

_ move 8192# Define ms_rec 16384/* recursively creates and mounts the directory subtree */# Define MS _ silent 32768# Define ms_posixacl (1 # Define ms_unbindable (1 # Define ms_private (1 # Define ms_slave (1 # Define ms_shared (1 # Define ms_relatime (1 # Define ms_kernmount (1 # Define ms_ I _version (1 # Define ms_strictatime (1 # Define ms_active (1 # Define ms_nouser (1 Ms_bind makes a file or directory visible at another point in the system directory tree. operations on the original dir

Conntrack kernel Reading Notes in netfilter (5)6. Principle of TCP filter: When the filter receives the first packet of a connection, it creates a table item for the connection in the global connection table, create original tuple and reply tuple with the source, destination IP, and port tuples carried in the message. The two tuple are different from each other to identify the connection. Subsequent packets

Getting started with crazy summer vacation Study Notes (5)-a program containing multiple segments Reference: Chapter 6th of Assembly Language 1. Use Data in the code. assume cs:codecode segmentdw 0123h,0456h,0789h,0defhmov ax,0mov bx,0mov ax,4c00Hint 21hcode endsend DW indicates defining the font data and DB indicates defining the byte data. The above code is compiled and connected, and debug is

*, struct pt_regs *), unsigned long flags, const char * dev_name, void * dev_id ); Parameter Parsing: Unsigned int IRQ // request interrupt number Irqreturn_t (* Handler) // handle function pointer installed. Unsigned long flags // bit mask of an option related to interrupt management. The shared interrupt is set to irqf_shared. Const char * dev_name // The string passed to request_irq is used in/proc/interrupts to display the owner of the interrupt Void * dev_id // used as the pointer to the