learning python fifth edition

is a reference to the two const string.When we use the function name as a value, the Change function is automatically converted to a pointer.void Usebright (const string AMP;S1, const string AMP;S2, BOOL PF (const string , const string ));Equivalent to: PF is automatically converted as a parameter to a pointervoid Usebright (const string AMP;S1, const string AMP;S2, BOOL (pf*) (const string , const string ));Similarly, the simplest way to declare a function that returns a function pointer is to

The fifth day of python learning and the fifth day of python Learning 1. decorator: #! /Usr/bin/env python3 User_status = False # change this value to True when the user logs on. Def login (auth_type): # upload the module to be ex

C + + Primer (Fifth edition) learning Note _4_ Standard Template Library string (1)1. Create a String ObjectCreates an empty string with a length of 0#include Operation Result:02. Assigning a value to a string objectThere are generally two ways of assigning values.(1) Assigning a value directly to a string object#include Operation Result:Hello, C + + STL.(2) The

C + + Primer (Fifth edition) learning Note _1_ Standard Template Library-Quick StartWelcome to read the reference, if there are errors or questions, please leave a message to correct, thank youThe Standard Template Library (STL) provides three types of components: containers, iterators, and algorithms, all of which support generic program design standards.There a

C + + Primer (Fifth edition) learning Note _7_ Standard Template Library _multiset multi-collection containerThe Multiset container multiset, like set, also uses a red-black tree to organize the element data, and the only thing not to do is that Multiset allows duplicate element key values to be inserted. The structure is as follows:1. multiset element Insertion#

C + + Primer (Fifth edition) learning Note _9_ Standard Template Library _multimap multi-mapping containerThe multi-mapping container multimap is basically the same as the map structure, but because of the duplicate key values, the Multimap element insertion, deletion, and lookup are not the same as the map method.1. Multimap object creation, element insertionWhe

Programming Category 13.1URL: P396 Category 13.2InetAddress: P398 13.3 Socket: P399 13.3.4 13.4UDP Datagram: P407 13.5 Broadcast datagram: P411 13.6Java Remote Call: P414 14th. Graphics, images and audio 14.1 Drawing the basic graphic: P425 14.2 Transform Graphics: P427 Boolean operation for 14.3 graphs: P429 14.4 Draw the Clock: P430 14.5 Drawing images: P433 14.6 plays audio: P434 The 15th chapter generic and set-up frame

-static field of the current object to the new object. If the field is of value type, a bitwise copy of the field is performed. If the field is a reference type, the referenced object is copied and not copied, so the original object and its replica refer to the same object. Deep replication, that is, the implementation of the ICloneable interface. ICloneable can be used for deep copy and shallow copy.To illustrate: Public class Content { publicint Val;}Shallow copy (shallow copy) Public cla

C + + Primer (Fifth edition) learning Note _6_ Standard Template Library _set collection containerThe Set collection container implements the data structure of the balanced binary search tree of the red and Black Tree (Red-blacktree), and when the element is inserted, it automatically adjusts the sorting of the binary tree and places the element in the appropriat

C + + Primer (Fifth edition) learning Note _8_ Standard Template Library _map mapping containerThe element data of a map mapping container consists of a key value and a mapping data, which has a relationship of one by one mappings between the key value and the mapping data.The data structure of the map mapping container is also implemented using red and black tre

C + + Primer (Fifth edition) learning Note _2_ Standard Template Library vector (1)Welcome to read the reference, if there are errors or questions, please leave a message to correct, thank youVector container vectors not only can be randomly accessed as arrays, but can also be used to insert elements at the tail, which can replace arrays.It is important to note t

operand.If the operands of an arithmetic or relational operation have multiple types, they need to be converted to the same type.A type conversion also occurs when a function is called.2. A named coercion type conversion has the following form:cast-nameWhere type is the target type of the conversion and expression is the value to be converted. If type is a reference type, the result is an lvalue. Cast-name is one of the static_cast, dynamic_cast, Const_cast and reinterpret_cast. Dynamic_cast su

the difference between hiding and overridingImplementation of the interface:1) All interface members are public2) interface members cannot contain code bodies3) interface cannot define field members4) Interface members cannot be defined with the keyword static/virtual/abstract/sealed5) Type-defined member is forbiddenTo implement an interface in a class:The class that implements the interface must contain the implementation code for all members of the interface, and must match the specified sig

:#!/usr/bin/python# Filename: reference.pyprint ‘Simple Assignment‘shoplist = [‘apple‘, ‘mango‘, ‘carrot‘, ‘banana‘]mylist = shoplist # mylist is just another name pointing to the same object!del shoplist[0]print ‘shoplist is‘, shoplistprint ‘mylist is‘, mylist# notice that both shoplist and mylist both print the same list without# the ‘apple‘ confirming that they point to the same objectprint ‘Copy by making a full slice‘mylist = shoplist[:] # make a

1. PrefaceA python tuple (tuple) is similar to a list, except that tuples cannot be modified, that is, once a tuple is created, you cannot add new elements to a tuple, you cannot delete elements in an element, and you cannot modify elements in tuples. But tuples can access any element that can be sliced and iterate through, and tuples can be understood as a read-only list.2. Creation of tuplesTuple creation is simple, tuples use parentheses, just add

Simple web layer-3 architecture system (fifth edition) and web layer-3 (Fifth Edition) Next to the previous version, the three-tier architecture background code is almost finished today. After this version is completed, the front-end code is created. The front-end is not familiar and is still

) Match phone numberimport re pattern="\d{4}-\d{7}|\d{3}-\d{8}"匹配电话号码的正则表达式 string="0216728263682382265236" result=re.search(pattern,string) print(result) Match e-mail addressimport re pattern="\w+([.+-]\w+)*@\w+([.-]\w+)*\.\w+([.-]\w+)*"#匹配电子邮箱的正则表达式 string="result=re.search(pattern,string) print(result) What is a cookieHTTP is a stateless protocol, which means that the state between sessions cannot be maintained. Cookies can be saved in a state.Cookiejar Combatimport urllib.reques

(M.group ())Match IP V4ip_addr = "inet 192.168.60.223 netmask 0xffffff00 broadcast 192.168.60.255" m = Re.search ("\d{1,3}\.\d{1,3}\.\d{1,3}\.\d {1,3} ", ip_addr) print (M.group ())Group matching addressesContactInfo = ' Oldboy School, Beijing changping shahe:010-8343245 ' match = Re.search (R ' (\w+), (\w+): (\s+) ', ContactInfo) #分组 "" ">>> match.group (1) ' Doe ' >>> match.group (2) ' John ' >>> Match.group (3) ' 555-1212 ' "" "match = Re.search (R ' (? pMatch Emailemail = "[email prote

[2][0] ='X'>>> T[2][1] ='Y'>>>T ('a','b', ['X','Y'])This tuple is defined by 3 elements, respectively ‘a‘ , ‘b‘ and a list. Doesn't it mean that once a tuple is defined, it's immutable? Why did you change it later?Don't worry, let's take a look at the definition when the tuple contains 3 elements:When we put the list element ‘A‘ and ‘B‘ modify ‘X‘ it to and ‘Y‘ after, the tuple becomes:On the surface, the elements of a tuple do change, but in fact it is not a tuple element, but a list element. T

', ' h ', ' I ']) #队列可转换为列表 >>>list (d) [' G ', ' h ', ' I '] #右扩展 >> >d.extend (' JKL ') >>>ddeque ([' G ', ' h ', ' I ', ' j ', ' K ', ' l ']) #左扩展 (reverse join queue) >>>d.extendleft (' abc ') >>>ddeque ([' C ', ' B ', ' a ', ' G ', ' h ', ' I ', ' j ', ' K ', ' l ']) #右轮换 >>>d.rotate (1) >>>ddeque ([ ' L ', ' g ', ' h ', ' I ', ' j ', ' K ']) #左轮换 >>>d.rotate ( -1) >>> Ddeque ([' G ', ' h ', ' I ', ' j ', ' K ', ' l ']) #统计队列中元素出现的次数 >>>d.extend (' Ghijk ') ) >>>ddeque ([' G', ' h ', ' I