Python

Variables and AssignmentsName= ' Mike ' #这里一定要注意, if the value on the right is not a number, be sure to quote, otherwise the system will think that the right side is a variable, and the right side we want to be a value, so we need to add a single

from Import datetime # gets the current datetime Print (now) Print (now)class'datetime.datetime'>Gets the specified date and timeTo specify a date and time, we construct one directly with the parameter datetime : from Import datetime # To create a

Daniel should have a good understanding of the path, this article mainly for the introduction of small white like me to use common sense, ah haThe following paths are described for Windows, and other platforms are not very well known for the time

#coding = Utf-8import Osimport sysif (os.getuid () = = 0):p asselse:print ("is not root user") Sys.exit (1) #version = input ("Please input Python version (2.7/3.6)") Version = 2.7if Version = = 2.7:packagename = "Python-2.7.13" else:packagename =

Functiondef function name (formal parameter): parameter not defined in front, local variableParametersMust parameter must be passed in the correct orderKeyword parameters can be added to the keyword without the need for proper sequence of

1 #-*-coding:utf-8-*-2 ImportHtmltestreport3 ImportHtmltestrunner4 ImportOS5 ImportSYS6 Import Time7 ImportUnitTest8 fromSeleniumImportWebdriver9 Ten One classBaidu (unittest. TestCase): A defsetUp (self): -Self.driver =Webdriver. Firefox ()

Coding problems have always been a headache when programming with Python, and the program often encounters the following error message:Unicodedecodeerror: ' ASCII ' codec can ' t decode byte 0x?? In position 1:ordinal not in range (128)This is

The acquisition of command-line parameters is useful for some functional scripts and does not write functionality to the script.Shell command-line arguments directly with $1,$2 and so on can be directly obtainedWhere $ $ represents the second

One, PackagePackageHides the properties and implementation details of an object, providing public access only to the outside.Benefits1. Isolate the changes;2. easy to use;3. Improve reusability;4. Improve safety;"Encapsulation principle"1. Hide the

For the shallow copy and deep copy of lists, dictionaries, tuples, numbers and strings are not shallow copy and deep copy one says. Below I directly use the code to reflect:1 ImportCopy2 3names =

and Operation : Only two Boolean values are true when the result is true.True and True # ==> truetrue and False ==> Falsefalse and True ==> falsefalse and false ==> falseor Operation : evaluates to true as long as there is a Boolean value of

1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 #@Date: 2017-08-24 10:17:284 #@Author: Enderzhou ([email protected])5 #@Link: http://www.cnblogs.com/enderzhou/6 #@Version: $Id $7 8 ImportRequests9 fromBs4ImportBeautifulSoup as BSTen ImportThreading

Python-based socket programming A TCP/IP five layer modelIn each layer of the work of different devices, such as our common switches work in the data link layer, the general router is working in the network layer.The protocols that are implemented

Variable parametersIn the Python function, you can also define mutable parameters. As the name implies, the variable parameter is the number of parameters passed in is variable, can be one, 2 to any, or 0.We take the math titled example, given a set

Python version management &virtualenv management Virtualenvwrapper is an extension pack for managing virtualenv, which is handy. Note that in Python3, Pip is installed: sudo apt install python3-pip Python2:sudo Apt Install

This article is mainly for you to introduce the use of Aardio python to write a graphical interface method, with a certain reference value, interested in small partners can refer to The former is writing some small programs in Python, and then

Python3 uses Print to output a color font, python3print Phton3 uses print to output color fonts.   Implementation process:The Character Color of the terminal is controlled by escape sequence. It is the system display function in text mode and has

[Python] UnicodeEncodeError: 'gbk' codec can't encode character solution, Compiling a python script in windows causes serious Encoding Problems. When writing network data streams to files, we will encounter several encodings: 1: # encoding = 'xxx'

What's the python variable, basic data type, whatpython What's the variable The type declaration is not required for variable assignment in Python. Variables are created in the memory, including the variable identifier, name, and data. A variable

Python Sequence Modification, hash, and Slicing, Vector: User-defined sequence type We will use the combination mode to implement the Vector class without using inheritance. The vector component is stored in the floating-point array, and the method