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login is not purple, crawler login Please refer to the previous blog) 2, I put all the hotel home page into the queue, where the use of the common deque module, in order to prevent the site ban crawler, so in the post to the crawler disguised as a browser (see the previous blog) for each hotel read to data, here is an example of obtaining the evaluation user name: # in the previous note, the content is to use Google or fiddle or to view the saved HTML data contains a string of user nam

least 9s is required to complete the first retry, and Connect-time is less than 9s). Therefore, the error 4 is reported. In a test set to connect-time=10s, the client initiates a connection for the first time, lasts 3s, does not succeed, retries for the first time, retries, does not succeed, arrives at connect-time time, and the client disconnects. Therefore, the error 110 is reported. In summary, assume that the value of/proc/sys/net/ipv4/tcp_syn_retries is n Then, when the TCP initiates the c

{print sum} ' 7.txtTo #6, add a custom character:Ifconfig eth0|grep "Bcast" |awk ' {print ' IP_ ' $ $} ' awk-f: ' {print ' UserName: ' $ '/etc/passwd#7, formatted output passwd content, printf print string,% formatted output delimiter, s denotes string type, 12 is 12 characters, 6 means 6 characters:Awk-f: ' {printf '%-12s%-6s%-8s\n ', $1,$2, $NF} '/etc/passwd#OFS输出格式化 \ t:Netstat-an|awk ' $6 ~/listen/nr>=1nr#8, awk and if combination combat, judge th

threading Import ThreadImport Os,timedef work ():Res=0For I in Range (100000000):Res*=iIf name = = 'main':L=[]Print (Os.cpu_count ()) #本机为4核Start=time.time ()For I in range (4):P=process (target=work) #耗时5s多P=thread (target=work) #耗时18s多L.append (P)P.start ()For P in L:P.join ()Stop=time.time ()Print (' Run time is%s '% (Stop-start))If multiple concurrent tasks are I/O intensive: multithreading is highly efficientFrom multiprocessing import ProcessFrom threading Import ThreadImport threadingImp

when we write the code?Below, let's compare two ToString code snippets:Snippet D: Public String toString () { string str = ""; for (int i=0;iSnippet E: Public String toString () { StringBuilder strbuilder = new StringBuilder (); for (int i=0;iSo, will the performance of Snippnet D and snippet E be the same?A simple test will show that the performance gap between the two is large,Snippet D takes about 12s, but S

simultaneously3. Output logs to both file and screen at the same timeImportLogginglogging.basicconfig ( level=logging. DEBUG, Format='% (asctime) s% (filename) s[line:% (lineno) d]% (levelname) s% (message) s', Datefmt='%a,%d%b%Y%h:%m:%s', filename='Myapp.log', FileMode='W')##################################################################################################define a Streamhandler, print info-level or higher log information to a standard error, and add it to the current log processi

' +--------------+---------+-----------+ ' while read line; do if [-Z "$line"]; Then printf ' | %-12s | %-7s | %-9s |n ' $p _id $c _id $s _id echo ' +--------------+---------+-----------+ ' continue fi if echo "$line" | Grep-q "^processor"; Then p_id= ' echo ' $line | Awk-f: ' {print $} ' | Tr-d ' ' fi if echo "$line" | Grep-q "^core id"; Then c_id= ' echo ' $line | Awk-f: ' {print $} ' | Tr-d ' ' fi if echo "$line" | Grep-q "^phySical ID "; Then s_i

#-*-Coding:utf-8-*-import sysimport win32apiimport win32conimport win32eventimport win32serviceimport Win32serviceutilimport servicemanagerimport loggingimport osfrom http.server import Httpserver, Cgihttprequesthandlerclass Httpfilerserver (Win32serviceutil. Serviceframework): _svc_name_ = "Httpfileserver" _svc_display_name_ = "HTTP File Server" _svc_description_ = "HTT P File Server "_svc_data_dir = ' D:\\screenrecorder ' def __init__ (self, args): Win32serviceutil. Serviceframework.__init__ (

.#dirname () returns the first part of the path, if combined with basename () to get the original path#dirname (PATH)def path (P):P= (P)For I in P:print '%15s:%s '% (I,os.path.dirname (i))The #splitext () function is similar to split (), but it decomposes the path based on the extension delimiter instead of the directory delimiterdef path (P):P= (P)For I in P:print '%15s:%s '% (I,os.path.splitext (i))#查询扩展名时, only the last occurrence of os.extsep is used, and if a file name has multiple extensio

-name:fadeinout; -webkit-animation-timing-function:ease-in-out; -webkit-animation-iteration-count:infinite; -webkit-animation-duration:12s; -webkit-animation-direction:alternate;}As a figure, the picture fades and fades. You are interested to click here: Image Unlimited auto Fade effect DemoThese effects are all related to transparency. The following example is linked to the picture position, proportional size, smart you think of the trans

to enter these parameters interactively.Now, to see how parallel code works, we need to assign enough task load, otherwise the overhead of creating and destroying threads will interfere with the test results, making our parallel tests meaningless. The input image should be large enough to show improvements in the performance of the parallel code. To this end, I used a 16000x10626 pixel size of the PPM format picture, space occupied about 512MB:I used the GIMP software to mix some clutter into t

The Nova provides NUMA-related advanced features under the NFV scenario, which provides a script to view the NUMA-related information for compute nodes. #!/bin/bash function Get_nr_processor () {grep ' ^processor '/proc/cpuinfo | wc-l} function get_nr_socket () {grep ' Physical ID '/proc/cpuinfo | Awk-f: ' {print $ | "Sort-un"} ' | Wc-l} function Get_nr_siblings () {grep ' siblings '/proc/cpuinfo | awk-f: ' {print $ | ' Sort-un '} '} function Get_nr_cores_of_socket () {grep ' CPU cores '/

S.year Desc,s.id DESC Average Enquiry 100 Time: 30S The third type of programme： Copy Code code as follows: SELECT * from ARTICLE W1, ( SELECT Top ID from ( SELECT Top 1030 ID, year from ARTICLE, DESC, id DESC ) w ORDER by w.year ASC, w.id ASC ) W2 WHERE w1.id = w2.id ORDER by W1. Year DESC, W1.id DESC Average Enquiry 100 Time: 12S Fourth Scenario： Copy Code code as follows: SELECT * FROM

In the day-to-day operation of the flow of traffic will find the phenomenon of sudden increase or increase in server load and so on, in order to find out why, need to use the Nginx limit module to access IP restrictions, and then can analyze the log.Configure Nginx to restrict IP access and configure multiple zone. Limit_req_zone $binary _remote_addr zone=allips:10m rate=20r/s; Parse script for the resulting nginx log. # #提供默认日志路径和名称Logsfile= "journal name"# #配置多个zoneNameZonename= "Allips nam

By using the + operator, append the array elements on the right (excluding those elements that have the same key value as the array element on the left) to the left array, but the duplicate key values are not overwritten. Cases: $a =array ("a" => "Apple", "B" => "banana");$b =array ("A" => "pear", "B" => "Strawberry", "C" => "cherry");$c = $a + $b;Var_dump ($c);echo "$c = $b + $a;echo "\ $b +\ $a result Var_dump ($c);?> The average time that a child finishes a race Topic: In the sports mee

seconds. 5 Seconds No response even if timeout, has been accumulated to 10 times without a response to the NFS storage is lost, only to initiate failover action. The middle of this actually passes through 12s*10+5s=125 seconds time. That is to say, really want to initiate a failover event, ESX host to wait 125 seconds. Q: So, what's happening from the VM's point of view in the 125 seconds? A: The VM will find that the disk connected on its VSCSI co

average size is 1MB, it is obviously inefficient to access GFS master each time it is appended, so gfs authorizes the write permission of each chunk to chunk Server through the lease mechanism. The implication of writing lease is that Chunk server has write permission for a Chunk within the lease validity period (assuming 12s), lease server with Chunk is called primary Chunk server, if primary Chunk Server down, chunk write lease can be assigned to o

~ 16MB, with an average size of 1MB, it is obviously inefficient to access GFS master every time it is appended, so gfs authorizes the Write permission for each chunk to chunk Server through the lease mechanism. The meaning of writing lease is that Chunk server has write permissions for a Chunk within the lease validity period (12s), and lease server with Chunk is called primary Chunk server if primary Chunk Server downtime, chunk write lease can be

save the database as a Microsoft Access database (2002~2003 format). - //remember not to directly modify the file's extension to. mdb, otherwise it will report "Cannot open database" (unknown). The application may not recognize the - //the database, or the file may be corrupted. The application may not recognize the database, or the file may be corrupted. "Error. in - //create the SQL statement, execute the statement, return the result set; toStatement Statement =conne

################################################################################################## Define a Streamhandler, print the info level or higher log information to a standard error, and add it to the current log processing object #console=logging. Streamhandler () console.setlevel (logging.info) Formatter= Logging. Formatter ('% (name) -12s:% (levelname) -8s% (message) s') Console.setformatter (formatter) Logging.getlogger ("'). AddHandler (c