Python

Project HomeOfficial documentsSupport parsing, splitting, and formatting of SQL statementsModule compatible with python2.7 or no less than python3.3 versionInstallation1. Source Code Installation2.PIP InstallationEntryModule level provides three

Python's third-party library is powerful, easy to use, and not too cool.First Look at TCP programmingThe service model for TCP includes connection-oriented services and reliable data transfer services, first three handshake, a full-duplex connection,

One, today try to run a multi-passenger Python script to order, always encounter Elements not visible or not clickable errorWorkaround:1. First look at the script run, the error element is visible in the page, if not seen, try to make this element

Introduction: First we have an assignment operation as a primer, as follows1L1 = [1, 2, 3, ['Java','python']]2L2 =L13L1[0] = 1114 Print(L1)#output results: [111, 2, 3, [' Java ', ' Python ']]5 Print(L2)#output results: [111, 2, 3, [' Java ', '

71406746 is that the same as this effect? #-*-Coding:utf-8-*- Import Base64 With open ("C:\\users\\user\\desktop\\20170508134213.png","RB") as F: # B64encode is encoded, B64decode is decoding Base64_data =

Dictionary (dict)DIC is a mapping type, consisting of key-value pairs enclosed in {}, and key is unique in Dict. When saving, the only memory address is calculated based on key. The key-value is then saved in this address. This algorithm is called

I. Errors and anomaliesProgrammers make mistakes, so every programmer has to test their code frequently, and the error code is divided into two types:1. Syntax error: The syntax detection of the Python interpreter is automatically detected.2. Logic

1.gevent executionimport geventdef func1(): print(‘func1 start‘) gevent.sleep(2) print(‘func1 end‘)def func2(): print(‘func2 start‘) gevent.sleep(1) print(‘func2 end‘)def func3(): print(‘func3 start‘) gevent.sleep(0) print(

Tag:list    Otherwise     recursion     judgment     will     hello    removal     successful    trim    #切片: # l = [' aaa ', ' BBB ', ' CCC ', ' DDD ']# print (L[1:3]) #取 [1, 3): Subscript # L = List (range) # print (L[:10]) # print (l[-10:]) # #

RE Module (* * * * *)In essence, a regular expression (or RE) is a small, highly specialized programming language (in Python) that is embedded in Python and implemented through the RE module. The regular expression pattern is compiled into a

1. Pipe use‘‘‘管道Pipe‘‘‘from multiprocessing import Process,Pipedef f(conn): conn.send(‘child message‘) conn.close()if __name__==‘__main__‘: parent_conn,child_conn=Pipe() p=Process(target=f,args=(child_conn,)) p.start() print(parent_

#压缩操作#打开或新建压缩文件zp = zipfile.ZipFile(‘xxx/xxxx/xx.zip‘,‘w‘,zipfile.ZIP_DEFLATED) #设置zipfile.ZIP_DEFLATED参数,压缩后的文件大小减小#向压缩文件中添加文件内容zp.write(‘source_path‘,‘goal_path‘)#关闭压缩文件对象zp.close()#解压操作#打开压缩文件zp =

Exception exception contains many kinds of exceptions, such as 0 exception, Nameerror exception inheritance exception exceptionCustom Exceptions:classNametoolongerror (Exception):PassclassNametooshorterror (Exception):PassdefInputName (): Name=

Python is a high-level scripting language that combines explanatory, compiled, interactive, and object-oriented.Python's design is highly readable, with English keywords often used in other languages, some punctuation in other languages, and it has

Import OSResponse = Urllib.request.urlopen ("Http://pvp.qq.com/web201605/js/herolist.json")Hero_json = Json.loads (Response.read ())Hero_num = Len (Hero_json)# folder does not exist then createSave_dir = ' C:\heroskin\\ 'If not os.path.exists

1. Thread Startdef run(n): print(‘%s in thread...‘%n)t=threading.Thread(target=run,args=(n,))t.start#线程等待t.join2. Multithreading starts simultaneously and waits for execution resultsdef run(n): print(‘%s in thread...‘%n)t_res=[]for i in range(1

1 __author__="Yang Xin"2 fromSysImportstdin3 #give a bunch of numbers, first delete the first number, and then put the second number at the end of this string of numbers4 #Then the third number is deleted and the next number is placed at the end of

1. Lists (list)In the [] enclosed, each element is separated by "," and can hold various data types,1.1 Indexes and slicesLike a string, a list is also an iterative object, so there are indexes that can be slicedThe index is also starting at 0, and

First, what is inheritanceInheritance is a way to create a new class, in Python, a new class can inherit one or more parent classes, and the parent class can also be called the base class live superclass, and the new class is called a derived class

Ref: 54891917Ref: 51538814Reference: https://www.cnblogs.com/linxiyue/p/7442232.htmlDjango File storage: https://docs.djangoproject.com/en/dev/ref/files/storage/Django View receive: https://docs.djangoproject.com/en/dev/ref/files/uploads/#django.