python programming course hk

Python/socket programming of sticky bagSticky Bag:Only TCP has a urine packet phenomenon, UDP will never sticky packets.First you need to master a socket to send and receive messagesthe principleThe sender can be 1k,1k send data and the receiving end of the application can 2k,2k extract data, of course, it may be 3k or more K extract data, that is, the applicatio

Python-based socket Programming (III)What can be achieved with socket-based communication implemented earlier? In the TCP protocol communication is a user said a sentence, the service side to you back, you give the service side to say, the service side to give you back a sentence, so always friendly play down. And so on, another user came, he also want to and the service side of the exchange, so he sent a m

divide the problem into smaller and separate parts to solve all problems at the same time. Parallel programming is just a way to accomplish a common task by working concurrently with multiple processor cores. Each processor core resolves a part of the problem (a separate section). In addition, in the process of processor core calculation, the interaction of data information will occur between them, this will involve, such a problem, on the data infor

We often say that the computer network communication, it is worth two, or more than one computer, for data transmission.Since the development of computer network, people use a lot of protocols, but the most commonly used is the TCP/IP protocol, which is actually a set of protocols.Of course, when using Python for network programming, we usually program on the TCP

Read Catalogue A primer Introduction of two-way co-process Three Greenlet Four Gevent Introduction Synchronization and asynchronous of five Gevent Application example of six gevent Seven Gevent application Example two A primerThe topic in this section is to implement concurrency based on a single thread, that is, to implement concurrency with only one main course (obviously the only CPU available), so we need to l

In the Collections module of the namedtuple class bit field, accessing data through attributes with namedtuple makes our code more intuitive and better maintained, the following describes the usage of the namedtuple class in Python Programming. the Collections module of Python provides a lot of useful data container types. one of the excellent products is namedtu

First, the basic knowledgehttp://blog.csdn.net/pi9nc/article/details/9734437Second, the analog loginBecause last semester took part in a big data game, need to crawl data, so just want to write a crawler crawl Sina Weibo data.Of course crawling data is not aimless, I need to follow the key words to crawl related Weibo.Just like Weibo has an advanced search feature, but to get more tweets, you need to log in, so you'll need to simulate a login.The foll

, and built-in support makes it easy. Every version, Python is supported in more places.1. How to use the context Manager:How to open a file and write "Hello World"Filename= "My.txt" mode= "W" Writer=open (filename,mode) writer.write ("Hello World") writer.close ()　　When an exception occurs (such as when the disk is full), there is no opportunity to execute line 5th. Of course, we can use the try-finally st

In-depth analysis of the usage of the super keyword in Python programming, pythonsuper There are not many definitions about super in the official document. It generally means that a proxy object is returned so that you can call some inherited methods. The search mechanism follows the mro rules, the following example shows the most common scenarios: class C(B): def method(self, arg): super(C, self).metho

the form of return ' a ', [A, ' B '], ' C ' feeling like returning multiple values, in fact a tuple.94. The interactive mode is also a tuple>>>1,2,3>>> (1, 2, 3)95. The function does not have a clear indication of the return value. The return is None96. Return value 0->none 1->object >1->tuple97.def foo (a,*b,**c)The Declaration and definition of the 98.python function together99. Functions can also have attributes such as: __doc__100.

Originally selected this course, because the new district did not choose a class, chose a part of the class, picked this. In fact, I am a little helpless, because my C linguistics is general, and Python language Program Design This course is very tall (a bit difficult). In the vivid explanation of Xiao teacher, I learned that it is more concise than the C languag

!Of course, the actual code must not be written like this, this is to illustrate the function name is also a variable . To restore abs The function, restart the Python interactive environment.Note: Since the abs function is actually defined in __builtin__ the module, it is necessary __builtin__.abs = 10 to make the modified ABS point to the other modules .So when we write the program, this variable name ca

the Send method and the Recv method.4. When the transfer is complete, the client closes the connection by calling the Close method of the socket.The pseudo code is as follows:1 Create sockets, then connect to the remote address, socket, connect.2 Start sending data after the connection is established. Send (data), of course, can read the server from the buffer. RECV (BUFF)When 3 is complete, close the socket. CloseCs=socket (Socket.af_inet,socket.soc

Python multi-Thread programming (3): important functions and methods of the threading. Thread class, This article mainly introduces some main methods of the main class Thread in the threading module. The example code is as follows:Copy codeThe Code is as follows:'''Created on 2012-9-7@ Author: walfred@ Module: thread. ThreadTest3@ Description:'''Import threadingClass MyThread (threading. Thread ):Def _ init

Lai Yonghao (http://laiyonghao.com) Some time ago, I sent an articleArticle(See: http://blog.csdn.net/lanphaday/archive/2010/11/29/6043605.aspx), I talked about several features that I want to see in Python. The third message-oriented programming is easy to implement, so I tried to make it, we will announce it here today. Pypi: http://pypi.python.org/pypi/message Source code: Http://code.google.com/p/

,data,cookies=djl) #入参带有cookie, when the parameter is passed in, specify the cookies= parameter print( Req.json ())Example 5:Get request with Header' Http://127.0.0.1/api/user/all_stu ' = { 'Referer':'http://127.0.0.1/' = Requests.get (url,headers=header) #指定 headers= parameter print (Req.json ()) Example 6:Request to upload a file' Http://127.0.0.1/api/file/file_upload ' = { 'file': Open (R'C:\Users\bjniuhanyang\Desktop\ Figure \6bd9026dt935575932465690.jpg','rb')} #参数, If you upload

(N1):Return n1**2------------------#-*-Coding:utf-8-*-__author__ = ' Administrator '#非确定性缓存"""For nondeterministic functions, it is possible to produce different inputs even when specifying the same inputThe cache duration is set according to the average update time of the data"""#例子c={}def m (get_kye=get_key,s=c,arg=0):Def _m (f):def __ (*a,**b):Key=get_kye (F,*A,**B)TryV1,v2=s[key]Exp= (Arg!=0 and (v1) Except Keyerror as S:Exp=trueIf not exp:Return v2S[key]=time.time (), F (*a,**b)return s[ke

clone 自己的仓库地址2. 实验代码拷过去以后用3. git add -A .4. git commit -am "your comment"5. git push origin master以后再用就clone自己的代码仓库就okThree. SummaryIn this lesson we master the following points: About Wxpython Familiarity with the environment, especially git Can run out of Wxpython window Understand the differences between CLIENTDC and PAINTDC Draw Line If you draw a polygon through specific points, it is inconvenient, and if you calculate the area of the polygon, compare the size

processes, threads are easier to create revocable than processes, and in many operating systems, creating a line turndown creates a process 10-100 times faster, which is useful when a large number of threads require dynamic and rapid modification3. If multiple threads are CPU-intensive, there is no performance gain, but if there is a lot of computation and a lot of I/O processing, having multiple threads allows these activities to overlap each other, which speeds up the execution of the program

())#Main Thread Print(Threading.enumerate ())#along with the main thread, there are two running threads within Print(Threading.active_count ())Print('Main thread /master process') " "Printed results: Mainthread " "View CodeFive Daemon threads fromThreadingImportThreadImport TimedefSayhi (name): Time.sleep (2) Print('%s Say hello'%name)if __name__=='__main__': T=thread (target=sayhi,args= ('Egon',)) T.setdaemon (True)#must be set before T.start ()T.start ()Print('Main Thread') Pri