Python

Preparatory workPython is a high-level programming language for interpreting, object-oriented, and dynamic data types. Let's start by looking at whether Python already exists in the system and installing some development kits:Pre-Installation

Listing (list)is one of the most commonly used data structures in Python and other languages. Python uses brackets [] to parse the list. The list is mutable (mutable)--You can change the contents of the list.Corresponding operation:1, check ([]

Listing (list)is one of the most commonly used data structures in Python and other languages. Python uses brackets [] to parse the list. The list is mutable (mutable)--You can change the contents of the list.Corresponding operation:1, check ([]

Object-oriented programming--object oriented programming, short for OOP, is a programming idea. OOP takes objects as the basic unit of a program, and an object contains functions for data and manipulating data.Process-oriented programming treats a

First, what is the socketIn the TCP/IP five layer protocol, the software program that works at the application layer wants to send its data to the computer at the other end of the network and let that computer can parse the received data to the

String type (String)A string is ‘ any text enclosed in single or double quotation marks " , such as ‘abc‘ , and "123" so on.Note that ‘‘ or "" itself is just a representation, not part of a string, so the string is ‘abc‘ only a , b c this 3

First, interface and normalization of design:1. Normalization allows the user not to care about what the object's class is, just know that these objects have some functionality, which greatly reduces the user's difficulty in using it.2.

Configparser Module IntroductionUsed to generate and modify common configuration documents (config file).Configuration file formatA user profile is a collection of settings and files for the user to load the desired environment when the user logs on

ProblemWhen doing web-side UI layer Automation will encounter file upload operation, often a friend asked, here to summarizeSolution SolutionsThe first type: type=file upload file, similar to the following650) this.width=650; "src=" Http://p3.pstatp.

What is JSON:JSON (JavaScript Object Notation) is a lightweight data interchange format. Easy to read and write, but also easy to machine parse and generate. JSON takes a completely language-independent text format, but also uses a C-like family

First, the role of subprocessSubprocess is a module for executing system commands in a program, and the Popen method used in the main process to open a child process to execute a system command, unlike Os.system is that it can return execution

In Python, you can determine whether an element is in a list, using the keyword in and not.Examples are as follows:If you need to output the appropriate information, you can use the IF statement, here do not repeat.-----------------------------------

1. After the list selection, get the text content directly and get the value of the button that should be displayed after the selection.2. After the value value with a space, you can use. Strip () to delete the front and back spaces to assert3. Some

The Python program can be decomposed into modules, statements, expressions, and objects as follows:The program is composed of modulesModule contains statementsStatement contains an expressionExpressions set up and exported to an objectFirst, the

Exceptions and ErrorsOne: Syntax error (this error, the syntax of the Python interpreter cannot be detected, must be corrected before the program executes)#语法错误示范一if # syntax error demonstration two DEF test: pass# syntax error demo three print

I. The nature of the moduleWe write Python programs that often import many modules, what exactly is a module? In fact, the module is a python file, we import the module name is the name of the Python file, for example, we wrote a file called

The English literal of the socket is "hole" or "socket". As a BSD Unix process communication mechanism, commonly referred to as a "socket", used to describe IP addresses and ports, is a handle to a communication chain that can be used to implement

Classmethod (function) English Description: Classmethod is used to specify a method of a class as a class method, without this parameter specifying the class method as an instance method, using the following method: Class C: @classmethod def f

Algorithm Learning (11), algorithm Learning1. King and Queen Note: Game algorithm programming like chess has two main tasks: 1. Evaluate the location and check which parts can be taken; 2. Construct a very small algorithm to choose the location to

Python: For beginners of Level 3 menus, # Implement three levels of menus at the provincial and municipal levels #! /User/bin/env pythoncitys = {"Guangdong Province": {"Guangzhou City": ["Panyu District", "Tianhe District", "Baiyun district"],