Python

centos7 python installation and Yum problem solvingThe current system centos7.2, the system comes with a python version of 2.7.5. Now you need to use the Python2.6 version and you need to downgrade.One, install Python2.61.wget Download Python,python

In the Performance testing platform optimization process, because the start-up task is relatively frequent compared to other test tasks, and currently 30 times two packets of cross-contrast (30 times) test takes 30 minutes to complete, it is

Basic use of multiple processesImport Multiprocessingimport Osimport timedef run (): print ("Parent process:%s, child process:%s"% (Os.getppid (), Os.getpid ())) Time.sleep (2) If __name__ = = "__main__": P = multiprocessing. Process (Target=run)

ImportReImporturllib.request#Crawling Web pagesdefgethtml (URL): page=urllib.request.urlopen (URL) HTML=Page.read ()returnHTML#Get Image Addressdefgetimg (HTML): Rule=r'src= "(. *?\.jpg)" width'Rule_compile=re.compile (rule) img_list=re.findall

Recently engaged in the database, in order to put the picture file information into the database table, I began to study Python list image files, which found that because the IE temporary files have a lot of unwanted pictures, you need to filter out

fromCollectionsImportCounterImportSyslogfile=SYS.ARGVdefConcurrent (filepath): Timelist=[] with open (filepath) as F:line=F.readlines () forIinchline:timetmp= I.split (" ") ifLen (timetmp) > 2: Timelist.append (((timetmp[3]). Split ("/"))

Because I often use laptops to share WiFi, but do not want to start a laptop night (for low-carbon environmental protection well ~_~!), so every time with the use of DOS command shutdown, feel good trouble. Just recently, I was learning Python and

Python extracts the specified content based on a regular expressionRegular expressions are extremely powerful, and it is convenient to use regular expressions to extract the desired content.The following shows the use of regular expressions to

It's been a long time without writing technical blog, cover because of the recent learning knowledge, also did not summarize what is worth sharing content, so has been stopped pen so far. Recent work and nail development hit the hand, the official

Create a queue Import Queueq = queue. Queue () Empty (returns True if the queue is empty) Import Queueq = queue. Queue () print (Q.empty ()) #输出: True Full (returns True if the queue is filled) Import Queueq = queue. Queue (1) #指定队列大小q. Put (' a

Introduced Ulipad is a Chinese-developed Python Lightweight editor, a guide and a flexible programmer. It is like a class browser, the code automates many functions, such as HTML Viewer, directory Browser, wizard, etc. Download and install

Python Writing Login interface First, the demand To write the login interface: 1. Enter the user name and password to log in 2. Incorrect three-time lock account 3. Next login or Last account, prompt lock, direct exit (use to read and write files) 4

This article discusses the sample code of Python object-oriented approach Import Randomclass sprite:step = [ -2,+2,-3,+3] def __init__ (self,gm,point=none): SELF.GM = GM If Poin T is None:self.point = Random.randint (0,20) else:self.point =

Basic use of multiple processes Import Multiprocessingimport osimport time def run (): print ("Parent process:%s, child process:%s"% (Os.getppid (), Os.getpid ())) Time.sleep (2) if __name__ = = "__main__": p = multiprocessing.

If there is no such object as a generator, how can this simple "producer-consumer" model be implemented? Import time Def producer (): Pro_list = [] For I in range (10000): Print "Bun%s made ing"% (i) Time.sleep (0.5) Pro_list.append

Create The. pythonstartup file under the user directory, and enter the following script#python startup fileImportSysImportReadLineImportRlcompleterImportatexitImportOS#Tab CompletionReadline.parse_and_bind ('Tab:complete')#history

Usage of and and or in PythonFrom "dive into python"python in the and the expression is evaluated from left to right, and if all values are true, the last value is returned, and if there is a false, the first false value is Returned. or also from

Today saw a Python video, read the day01, feel very easy, because they have begun to contact python, the basic grammar with Python is still more familiar with, but some are relatively unfamiliar, through contact work, began to know how high their

Python -- Exception Handling, python exception Python provides two very important functions to handle exceptions and errors in the running of python programs. You can use this function to debug python programs. We can open idle --> F1 to view the

Python3 deque (two-way Queue), python3deque queue Create two-way queue import collectionsd = collections.deque() Append (add an element to the right) Import collectionsd = collections. deque () d. append (1) d. append (2) print (d) # output: deque ([