Python

Graphical user interfaceThis paper uses WxpythonThe methods in the WX package start with uppercase captionsImport Wxdef Load (event): File = open (filename. GetValue ()) contents. SetValue (File.read ()) File.close () def Save (event): File = open

1. Common Exceptions: Attributeerror attempts to access a tree that does not have an object, such as foo.x, but Foo has no attribute xIOError input/output exception; Basically, the file cannot be openedImporterror cannot introduce

The format of the Python string is divided into two types: 1)% mode 2) Str.format () mode.Str.format () is a newer way than%, and most Python code still uses the% operator. But will eventually be replaced by Str.format (), so we recommend using

1avilable_foods=["Soup","beaf","Noddle","Pepper"]2request_foods=["Soup","Susan","beaf","Suggar"]3 forRequest_foodinchRequest_foods:4 ifRequest_foodinchAvilable_foods:5 Print("adding"+request_food+".")6 Else:7 Print("sorry,we

1. DefinitionUse wrapper to release the functionality of the extension class, but do not use inheritance2. Usage Scenarios3. Code implementation#!/usr/bin/env python#! _*_ coding:utf-8 _*_defMydecorator (Before_func, after_func):defDecorator

It 's Valentine's Day now, give you a goddess. Flowers or something is not enough! In writing a confession process, to the Goddess Confession! Let her see your love! haha haha! Programs and code: Click to downloadAbout Python

1. The Python class attribute cannot be changed by the objectThe instance object cannot change the class property if the object is strongly written. class Property = XXX Just adds an instance variable to the object, and the instance variable's name

Apscheduler Official Document: http://apscheduler.readthedocs.io/en/latest/Write a background timer task, General 2 choices, one is Apscheduler, a celery,apscheduler more intuitive and simple.Installation: Pip Install ApschedulerSimple example:------

#-*-Coding:utf-8-*-Import PygameFrom pygame.locals Import *Import time‘‘‘Description1. Press the B key to let the player plane explode2. The principle of explosion effect is: change the picture‘‘‘Class Hero (object):def __init__ (self,

File processing: File processing includes reading files, writing filesRead the file:1. Open File2. Read the file3. Close the fileWrite file:1. Open File2. Write as File3. Close the fileWhether to read files or write files, you need to open the file,

Get length len (listname)Access Element Listname[index] Index=-1 provides easy access to the last elementadd element Listname.append (item) to add an element to the end of a listListname.insert (Index, item) inserts an element into the specified

Two ways (Verify syntax errors in Ok,python2 in Python3)# Method 1 for inch input (). Split ()] # method two num = list (map (int, input (). Strip (). Split ()))print numInput: 1 2 3 output: [1, 2, 3]Usage of map in PythonThe three maps (), filter (

1. Crawlers appear forbidden by robots.txtWorkaround: setting.py Robotstxt_obey = True to FalseCause: Scrapy the output of the capture packet can be found, before requesting the URL we set, it will first request a TXT file to the server root

A, Python object-oriented1. Object-Oriented Basics: Object-oriented three features: encapsulation, inheritance, polymorphismC # Java can only be programmed with object-orientedRuby,python function + Object oriented Functional

1. Create a list >>list1 = [' Apple ', ' banana ', ' parple ', ' pear ', ' apple '] 2. Copy operation >> list2=list1.copy ()>> List2[' Apple ', ' banana ', ' parple ', ' pear ', ' apple '] 3. Append operation >>

From the initial "Hello world", go to object-oriented. It's time to look back and see if there's anything missing from the tutorial.We mentioned a word before, "everything is Object". So let's take a deep look at this sentence.Need to first

Reference Links:Use of BS4 and requests: https://www.cnblogs.com/baojinjin/p/6819389.htmlInstalling pip:80293806#Python 3.x began to bring the PIP, if not please confident Baidu installed. #pip install BEAUTIFULSOUP4 requests

Data persistence: Data persistence is the general designation of converting in-memory objects into storage models, and converting storage models to objects in memory. An object can be any data structure or object model, and the storage model can be

Python operators are similar to other languages(We only know the basic usage of these operators for the time being, so we could expand the content later, the advanced application is not introduced at the moment)Mathematical Operations>>>print 1+9 #

One, module, packageWhat is a module?The module is essentially a Python file, which is used to organize the code, meaning that the Python code is written inside, the filename is the name of the module, test.py test is the module name.What is a