python intermediate tutorials

content from somewhere First step: encapsulate the content somewhereExercise two : Game Life ProgramD1=dog (' Fat family's little Skinny Dog ')d1.eat ()so the question comes again, how to inherit? Whether multiple classes can be inherited If you have inherited multiple classes that have the same function in each class, then that one will be used? 1. Python classes can inherit multiple classes, and Java and C # can inherit only

Python crawler Tutorials -25-Data Extraction-BEAUTIFULSOUP4 (iii)This article describes the CSS selectors in BeautifulSoupCSS Selector Use Soup.select to return a list By tag name: Soup.select ("title") By class Name: Soup.select (". Centent") ID Lookup: Soup.select ("#name_id") Combination lookup: Soup.select ("div #input_content") Property Lookup: Soup.select ("img[class= ' ph

(direction) {} templateinlinevoidRay3Const{point.x= m_origin.x + m_direction.x *T; Point.y= M_ORIGIN.Y + M_DIRECTION.Y *T; Point.z= M_origin.z + m_direction.z *T; } templateinline Vector3Const { returnVector3T, M_ORIGIN.Y+ M_DIRECTION.Y *T, M_origin.z+ m_direction.z *t); } }And then the Tutorial7.cpp." Tutorial7.h " "tutorial7.mh " "Tutorial7.ic" "tutorial7.mc"Because the template class code is written in the header file, so Tutorial7.cpp only need to include the corresponding f

) *0.5; } Statictriangle*New () {return NewTriangle; } };}The content is basically corresponding to the tutorial3.i in one by one.Then take a look at the contents of the script tutorial3.py:Import== = Paf.tutorial.Point (0,0); triangle.m_vertices[1] = Paf.tutorial.Point (0,1); triangle.m_vertices[2] = Paf.tutorial.Point (a); Print (Triangle.getarea (). _);A Tirangle object is created and the data member is set, where the runtime can detect that the subscript range is 0 to 2, if

SetSize (self,size): Self.width, Self.height = size def GetSize (self): Span style= "COLOR: #0000ff" >return Self.width, self.height>>> R = Rectangle () >>> r.width = 10>>> R.height = 5>>> R.getsize () (Ten, 5) >>> R.setsize ((150,100) >>> r.width150 In the example above, thegetsize and setSize methods have an accessor method named size with an imaginary attribute, and thesize is determined by the width and height constituent tuples. Property functionthe use of the property function is s

1. SequencePython contains 6 built-in sequences- lists, tuples, strings, Unicode strings, buffer objects, xrange objects2. General sequence operation2.1 IndexNote: input () transforms the corresponding type according to the user input, and if you want to enter characters and strings, you must enclose them in quotation marks.Raw_input () is converted into a character type regardless of the type of user input.2.2 Shardsnumbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10](1) numbers[:][1, 2, 3, 4, 5, 6, 7, 8,

First, the main ideas Scrapy Crawl is a course address and name Download using the multiprocessing Just to crawl a bit of video, so it's a simple code stack. The way you want to share it without practicing it. Ii. Description of the document itemsscray field piplines.py Storage database setting.py scrapy configuration You need to be aware of default_request_headers settings, need to impersonate the login mz.py is the main crawler is the basi

Basic python tutorials-A Dictionary of notes Create dictionary A dictionary consists of multiple key-value pairs. Each key and corresponding value are separated by a colon, and items are separated by a comma. The entire dictionary is enclosed by a pair of braces, as shown in figure >>> Phonebook = {'Alice ': '000000', 'betch': '000000', 'cecil': '000000 '}>>> Phonebook{'Betch': '000000', 'Alice ': '00000

instead of a statement, in other words, when the generator is newly run, theyield method returns a value, which is the value sent externally by the Send method. If the next method is used, then the yield method returns None. Here's a simple example to illustrate this mechanism:def repeater (value): While True: new = (yield notnone:value = new >>> r = Repeater>>> r.next () 42>>> r.send ("Hello, world!" )'Hello, world!' Another two ways to build the generator:*

= Urllib.request.urlopen (dic["Link"]) HTML=request.read () Soup= BeautifulSoup (HTML,'Html.parser') text_p= Soup.select ('#Article > Div.content > P')#get the data under the P tagText = []#Store article content forAinchText_p:text.append (A.get_text (). Encode ('Utf-8'))#Remove the text portion of the P tag, which is the content of the articleName = dic["title"] Directory='%s.txt'%name dir= Directory.replace ('/','_'). Replace ('*','@'). Replace ('"','o'). Replace ('?','W'). Replace ('

prices:prices = Tree.xpath ('//span[@class = "Item-price"]/text () ')Let's see what we Got:Print 'Buyers:', BuyersPrint 'Prices:', pricesbuyers: ['Carson Busses','Earl E. Byrd.','Patty Cakes','Derri Anne Connecticut','Moe Dess','Leda Doggslife','Dan Druff','Al Fresco','Ido Hoe','Howie Kisses','Len Lease','Phil Meup','Ira Pent','Ben D. Rules','Ave sectomy','Gary Shattire','Bobbi soks','Sheila Takya','Rose Tattoo','Moe Tell'] Prices: ['$29.95','$8.37','$15.26','$19.25','$19.25','$13.99','$31.57',

Python can run on almost any platform, as we are familiar with: Windows/unix/linux/macintosh.Here we say, install Python in the Windows operating system.My operating system is: Windows 7, 32-bitWhen we install Python, we can either install it from the source code or install it in a compiled and packaged binary version, which I chose.Step one Download the install

Tutorials DirectoryA: Python basics (a little, the basics is to read and learn it yourself)II: Bottle FoundationIntroduction to the Python Bottle web frameworkPython Bottle Framework Environment installationPython Bottle Framework Basics Tutorial: Routing (URL definition)Python Bottle Framework Basics Tutorial: HTTP Re

is it going?Because the statement, a is to be equal to (=) 2, because you pressed the carriage return, hahaSo...........A will be used as a label to hook up with this object (round things). (The room has been built, you can take the key to live in it)------------------------------------------------The old Wang in the next room also bought a house!?!? At this point, another object (round things) is created.b = 3Lao Wang took the key to live in , b as the label is tied to the new object.Finally,

Python calls other language tutorials: Call the C language:Note To install Python-dev (sudo apt-get install python-dev)#include intFactintN) { if(N 1) return 1; Else returnn * FACT (N-1);} Pyobject* Wrap_fact (pyobject* self, pyobject*args) { intN, result; if(! Pyarg_parsetuple (args,"i:fact", N))returnNU

+'+'+'-'* (box_width-4) +'+'PrintResultsSentence:he ' s a very naughty boy!+--------------------------+| || He ' s a very naughty boy! || |+--------------------------+ Member qualifications Use the In operator to check whether a value is in the sequence, that there is a return of true, that there is no return false, such as>>> numbers = [1,2,3,4,5,6,7,8,9]>>> 8 in numbersTrue>>> in NumbersFalse Length, minimum and maximum values Len-Returns the number of elements con

the same problem, the solution is to modify the library source code, the spirit of "Fixed library source code" concept, resolutely chose the above this relatively stupid method, the code is relatively good understanding.After the above steps, we want the PDF file has been generated, together to enjoy the fruits of labor:06. Saving ResultsWelcome everyone to follow my blog: https://home.cnblogs.com/u/sm123456/Interactive Communication in the blog parkWelcome to join thousands of people to commun

(['name',' Age'],'Unknown')6{' Age':'Unknown','name':'Unknown'}5.2. Using a dictionary Format string: 1 >>> items2 {'age''name' 'Gumby'}3"% (name) s ' s ' age ' s. " % items4"Gumby ' s is a. "1>>> template =" "2 ... 3 ... 4 ... 5 ... 6 ... " "7>>> data = {'title':'Panderen Home','text':'Welcome to my home page'}8>>>PrintTemplate%Data9Ten One A - -5.3. Dictionary methods The clear () method clears the value, and ={} is a reference to the variable (similar to the C langua

Python Machine Learning Practical tutorialsShare Network address--https://pan.baidu.com/s/1miib4og Password: WTIWThe course is really good, share to everyoneMachine Learning (machines learning, ML) is a multidisciplinary interdisciplinary subject involving probability theory, statistics, approximation theory, convex analysis, algorithmic complexity theory and many other disciplines. Specialized in computer simulation or realization of human learning b