coursera full stack web development review

threading Import Threadimport timedef Work (): res = 0 for i in range (10000000): res+=iif __name__ = = ' __main__ ': l = [] Start = Time.time () for I in range (4): P = Process (target=work) #1.9371106624603271 #可以利用多核 (i.e. multiple CPUs) # p = Thread (target=work) #3.0401737689971924 l.append (P) p.start () for P in L:p.join () stop = Time.time () print ('%s '% (Stop-start)) # I/O intensive to turn on multithreading from multiprocessing import processfrom threading Import Threadimport ti

Chapter One Python basicsChapter II Python BasicsChapter III Python Basics-file Operations FunctionsFourth Python basics-common modulesThe fifth chapter design and development of object-oriented programmingThe sixth chapter--socket development of network programmingSeventh Chapter concurrent ProgrammingEighth Chapter MYSQY DatabaseNineth Chapter Front-end developmentThe Tenth Chapter DjangoThe 11th Chapter

IP and port Executes the baseserver.__init__ method, assigning a custom inherited class Myrequesthandle from Socketserver.baserequesthandler to self. Requesthandlerclass Executes the Baseserver.server_forever method, while the loop is always listening for client requests to arrive ... When a client connection arrives at the server Executes the Threadingmixin.process_request method, creating a "thread" to handle the request Execute the Threadingmixin.process_request_thread me

statementIf condition 1:code blockElsecode block2) Nesting modeIf condition 1:If condition 2:......3) If elifWhile loopWhile condition:code block (until the condition is not met)Ps:Continue: Exiting the current loopBreak: Exit the entire loop6. Practice1) use while loop input 1 2 3 4 5 6 8 9 10num = 1 while num : if num! =7 :print num = num + 12) for all numbers of 1-100 andnum = 1= 0 while num : = sum +num = num + 1print sum3) All odd numbers in the output 1-100num = 1 whil

header_len = struct.unpack (' i ', PHONE.RECV (4)) [0] #吧bytes类型的反解 #在收报头 header_bytes = phone.recv (header_len) #收过来的也是bytes类型 header_ JSON = Header_bytes.decode (' utf-8 ') #拿到json格式的字典 header_dic = json.loads (Header_json) #反序列化拿到字典了 total_size = header_dic[' total_size '] #就拿到数据的总长度了 #最后收数据 recv_size = 0 total_data=b " While recv_size　　Five, struct module#该模块可以把一个类型, such as numbers, to a fixed-length bytes type import structres = Struct.pack (' i ', 12345

write a format formater1, so you can Logger.addhandler (stream_handler) return Loggerlogger = MyLogger (' Logging.log ', File=false) logger.warning (' Cheerleader ') logger.debug (' Debug message ') The Ogging library provides multiple components: Logger, Handler, Filter, Formatter. The Logger object provides an interface that the application can use directly, handler sends logs to the appropriate destination, and filter provides a way to filter the log information formatter specify the log dis

then specify the callback function (the main process is responsible for executing) so that the main process eliminates the I/O process when executing the callback function, and the result of the task is directly obtained. #回调函数 (small example of downloading a webpage) from multiprocessing import Poolimport Requestsimport Osimport timedef get_page (URL): Print (' If you wait for all the tasks in the process pool to finish executing in the main process and then process the results uniformly, you

design2) using sockets (or WebSocket)-based protocols: Xmpp/sip or MQTT3) Use the RESTful interface provided by the server2: Server cluster2.1 Load Balancing: Business-based cloud servicesWeb Services Some out-of-the-box framework can be selected Php:drupal js:express, etc., some framework integration of OAuth saves complex user authenticationOther business depends on the selection of technology2.2 Business Server clusters and database server clusters1) Integration of the two:Web Services Some

(status) + 1 Cp.set (user_name, ' status ', str (status)) with open (' user.conf ') , ' W ') as Fw:cp.write (fw) If status = = 3:print ("Your username is lo cked! Your administrator ") Break Else:print (" You input the username or pas Sword is wrong, try agin!! ") Count_other = count_other + 1 if Count_other = = 3:break Continue Else:co NF = configparser. Configparser () # write config file conf.add_section (' user ') #添加section # Add Value conf.set (' User ', ' user ', ' Ji MMY,AAA,

^ Match the start of a string $ Match the end of a string \w Match non-alphabetic or numeric or underscore or kanji \d Match non-whitespace characters \s Match non-numeric A|b Match character A or character B () Matches an expression within parentheses, and also represents a group [...] Match characters in a character group [^...]

Y, X is false, and the value is x;3. Not false is neither true nor false.Three-coding problem1. InterpreterThe PYTHON2 interpreter encodes the content with "ASCII";The PYTHON3 interpreter encodes the content with "UTF-8".2. Development of the coding systemASCII (US standard Information Interchange code) 8 bit 1 byte extended use limited;GBK (GBK compatible ASCII) 2 byte in China onlyeg: letter a:0100 0001 # ASCIILetter a:0000 0000 0100 0001 #

can bebetter maintenance and development.1. Define a functionDef creat_people ():Print ("Tuan clay, pinch clay figurines")Creat_people ()2. Adding featuresDef creat_people ():Print ("Watering") #增加功能 (but changed the code, not in accordance with the open closure principle)Print ("Tuan clay, pinch clay figurines")Creat_people ()"""Adorner Execution Flow1. Visit Warter (create_people) first.2. Pass your sign function to the parameter fn of the warter.

I have been following the video self-study for several days Python full stack development, today decided to listen to the teacher, began to write a blog, heard that the great God has come back to write a blog to record their growth. I particularly seriously follow this video to learn, (they start before the guarantee, I also wrote a copy, hahaha ...) I am now a q

python full Stack development-day2 Boolean Process Control loopA, Boolean1. Overview#布尔值, a true one false #计算机俗称电脑, that is, when we write a program to let the computer running, it should be to let the computers infinitely close to the human brain, or what the human brain can do, the computer should be able to do,The main function of the human brain is data oper

Full-stack python development-Day8 function basics, python-day8Full-stack python development-Day8 function basics I. Introduction 1. Why do we need to use functions instead of functions? #1. The code's organizational structure is not clear and its readability is poor #2. Whe

name": Find File (* file name *--fuzzy query) "Query by file name" Find Path-size +90m | Xargs ls-lh "Query by Size" Touch Path/File name: Create file RM File: Delete file (dangerous!) ） Tar zcvf name. tar.gz file 1 File 2 ... : Package A file FREE-M: Viewing server memory usage IP A: View current IP Address Useradd User name: Create user Chown. Genus Group file name: Owner and owner of modified file r--Read permission (4) w--Write permission (2) x--Execute permission (1)-—— n

Chapter Content Module Introduction Timedatetime Random Os Sys Shutil Jsonpickle Shelve XML processing YAML processing Configarser Hashlib Subprocess Logging First, Module introductionModule, a collection of code that implements a function with a single piece of code.Like functional programming and process-oriented programming, functional programming accomplishes a function, and other code is used to invoke it, providing reusabili

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Django https://www.djangoproject.com/ https://docs.djangoproject.com/en/1.10/ Http://www.ziqiangxuetang.com/django/django-tutorial.html Http://python.usyiyi.cn/django/index.html Python full stack

) # Counter ({' d ': 2, ' B ': 2, ' h ': 1, ' K ':-4}) # elements returns an iterator to how many times the element was repeated in that iteration How many of the elements are included in the device. # Elements with a number less than 1 are not included. The number of k less than 1 is excluded from print (List (c1.elements ())) # [' H ', ' d ', ' d ', ' B ', ' B ']print (C1.most_common (2)) #取出出现次数最多2个元素 [(' B ', 2), (' d ', 2)]　　　　　　　　Python