Python

Dbutils is a Python module that implements database connection pooling.There are two modes of connection for this connection pool:Mode one: Creates a connection for each thread, and the thread does not close even if the Close method is called, but

One, the list of additions and deletions to checkadd elements to the list:1, add an element from the end of the list: Append ("") 2, inserting an element from the list: insert (subscript position, inserted element)Merge list: 1,name.extend (name2)

40. Function Description:Document descriptionProcedure is a function with no return valueProcedures also have return values in Python: (Explicit)41. Function Introduction 2To realize the exhausting log functionReference the above time formatReturn

Variable:1. You must assign a value before using the variable;2. Variable names can be letters, numbers, underscores, but cannot start with numbers;3. The letters can be uppercase and lowercase, but the case is different, such as Fishc and Fishc are

The results are the same in two waysImport Hashlibimport Timem = Hashlib.md5 () m.update (str (time.time ()). Encode (' Utf-8 ')) print (M.hexdigest ()) m2 = HASHLIB.MD5 (str (time.time ()). Encode (' Utf-8 ')) print (M2.hexdigest ()) #

#方式一class  a ():     def __init__ (self, name):         self.name = name        print ("a  CLASS&NBSP, ...) class b ():     def __init__ (self, age):         self.age = age        print ("b  class ... ") class sub (a, b):     def __init__

Job 2:There is a list of List1 = [All-in-one, ' a ', ' B ', 4, ' C ']There is an unknown dictionary dict1, unclear internal key value pair conditionIf the Dict1 dictionary does not have a ' K1 ' key value pair, then create and set the value of the

""      White      Time: January 9, 2018      demand: Suppose you have a lot of cars, By constantly asking if you want to add a vehicle to your inventory,     if you do, then it will ask for details of the car. If not, the application prints the

Mainly from: [Python use xlrd, XLWT operation Excel table detailed]To facilitate reading, I split the original two modules into two posts:[Python read Excel module: XLRD][Python writes Excel module: XLWT]XlwtThe difficulty of writing Excel may not

The chicken saidLinks: https://www.jianshu.com/p/ceb99aed4b2eSource: PinterestNames and attributes can be located in BeautifulSoup by name and attrs to find specific HTML code. Even more commendable, ATTRS supports regular expressions.Such as:class="

Mainly from: [Python use xlrd, XLWT operation Excel table detailed]To facilitate reading, I split the original two modules into two posts:[Python read Excel module: XLRD][Python writes Excel module: XLWT]XLRD Basic OperationThis process has several

1, Regular expressionThe regular expression is used to make a string match, and the regular has his own rule, and Python has no relation, a rule that matches a string.2, character GroupThe various characters that may appear in the same location make

                     file Operations                                                               procedure for file operation Open the file, you can add filepath open a file under an absolute path, get a file handle and assign a value to

#CODING=GBKImporturllib.requestImportReImportOSImportUrllibdefgethtml (URL):#Specify URL fetch functionpage =urllib.request.urlopen (URL) HTML=Page.read ()returnHtml.decode ('UTF-8')defGetimg (HTML):#define get Picture functionReg = R'src= "(.

BackgroundRequirement: Print Word fileModule: Python-docxProblemPass the Xxx.doc file to the Python script, after execution, the console has no content outputAfter the inquiry learned that the general reason: Doc is an earlier generation of Word

Goal: The intention is to spend two or three weeks almost, less than one months to contact Python, Baidu can use the crawler what, do something personal to interest, and in the middle of the year to buy a "redis combat" inside is a python example. I

I. Installation of Beautiful Soup LibraryWin platform: "Run as Administrator" cmdExecute pip Install Beautifulsoup4Installation quiz: from BS4 import BeautifulSoupSoup=beautifulsoup (' data ', 'html.parser')Print (Soup.prettify ())Second, the basic

This article is mainly for everyone to bring a python crawl home housing site data (example). Small series feel very good, now share to everyone, also for everyone to make a reference. Follow the small series together to see it, hope to help

Python _ builtins _ classmethod class (11 ), 11. For 'classmethod', the modifier's function does not need to be instantiated and the self parameter is not required. However, the first parameter must be the cls parameter representing its own class

Python note (1): installation + crawler environment configuration + packaging as an EXE file, 1,Install Https://www.python.org/downloads/windows/Download the installer from the official website. Windows x86 32-bit Operating System Windows x86-64