Python

#!/usr/bin/python#-*-Coding:utf-8-*-#!/usr/bin/env pythonImport MySQLdbImport SysImport XlsxwriterReload (SYS)Sys.setdefaultencoding (' Utf-8 ')#创建一个EXCEL文件Workbook = Xlsxwriter. Workbook (' name.xlsx ') #EXCEL的文件名#创建一个工作表对象worksheet_1 =

Python is one of the best programming languages and is widely used in scientific computing: computer vision, artificial intelligence, mathematics, astronomy, etc. It also applies to machine learning and is expected.Of course, it has some drawbacks,

1.1   manipulating files and directories>>> Import OS>>> os.name # operating system type' POSIX '>>> Os.uname () # detailed system InformationPosix.uname_result (sysname= ' Linux ', nodename= ' daidai.com ', release= ' 2.6.18-194.el5 ', version= ' #1

1        Object-Oriented programmingObject-Oriented Programming:Object-Oriented programming -- Object orientedprogrammingOOP takes objects as the basic unit of a program, and an object contains functions for data and manipulating data.

There are two ways to format a Python string: a percent-semicolon, format-modeThe percent of the semicolon is relatively old, and format is a more advanced way to replace the old way, the two coexist.1, percent of the wayWhen formatting a string,

Paste the Python code belowknnclassify.py1 fromNumPyImport*2 Importoperator3 4 defCreatdataset ():5Group = Array ([[[1.0,1.1],[1.0,1.0],[0,0],[0,0.1]])6Labels = ['A','A','B','B']7 returnGroup, Labels8 9 defclassify

Today, Python reads a configuration file with many fields, similar to the format in the configuration file:Pidstart:2600startfid:47starttid:450startfirst:1message: "It is common to think of:Config = open (Configpath, ' R ') for item in config://set

I. DICT features1. Find Fast: The search speed is the same regardless of whether the dict has 10 elements or 100,000 elements. The search speed of the list decreases as the element increases.Cons: Take up memory, waste content, and list just the

Defining stringsWe've explained what strings are in front of us. Strings can be ‘‘ expressed in or "" enclosed.What if the string itself contains ‘ ? For example, if we want to represent  I‘m OK  a string, we can say it in " " parentheses:"I ' m

Steps for Python to write server:1.The first step is to create the socket object. Call the socket constructor. Such as:Socket = Socket.socket (family, type)The family parameter represents the address family, which can be either af_inet or Af_unix.

Python variables:In a computer program, a variable can be not only a number, but also any data type.In a python program, a variable is represented by a variable name, and the variable name must be a combination of uppercase and lowercase English,

BrieflySpark is the universal parallel framework for the open source class Hadoop MapReduce for UC Berkeley AMP Labs, Spark, with the benefits of Hadoop MapReduce But unlike MapReduce, the job intermediate output can be stored in memory, eliminating

Python provides two basic socket modules. The first one is the Socket, which provides the standard BSD Sockets API. The second is Socketserver, which provides a server-centric class that simplifies the development of Web servers. Here is the socket

This article mainly Selenium+python automatic test or crawler in the common positioning methods, mouse operation, keyboard operation introduction,Hope that the basic article is helpful to you, if there are errors or shortcomings, please Haihan

Memcached as the cache file service, the default is that the operating system can be installed directly yum-y install memcached./etc/init.d/memcached is a management script written by the system shell, and the following script is a Python

Timeout functionThe function is to add a timeout function to any function that may hang, which is especially useful when writing external API calls, web crawlers, database queries.The code for the timeout adorner is as follows:Import Signal,

When importing a file, Python searches only the directory where the current script is located, loading (entry-point) The Portal script run directory and the path contained in Sys.path such as the installation address of the package. So if you want

Basic string Location Lookup methodThe Python lookup string uses variables. FIND ("What to Look for" [, start position, end position]), start and end position, indicate the range to look for, or null to find all. The location is returned after

1. Log in to the SMTP serverFirst use the online method (here use 163 mailbox, smtp.163.com is the SMTP server address, 25 is the port number): Import Smtplibserver = Smtplib. SMTP (' smtp.163.com ', ' Server.login ') (' j_hao104@163.com ', '

Frist Django app-3. View, fristdjango I have already mentioned some usage of models in Django, including orm and operation APIs. Next I will take some simple interfaces to learn view-view in Django. This article mainly introduces the following two