Python

question No. 0009: An HTML file to find the link inside.Idea: For extracting hyperlinks in Web pages, it is more convenient to read the content of the webpage first and then use BeautifulSoup to parse it. But I found a problem, if directly extract

1. Basic usagePython provides a standard log interface, which is the logging module. The log level has debug, info, WARNING, error, critical five (level in turn), respectively, the corresponding function is debug (), info (), WARNING (), error (),

The basic concept of adornersAs you know, adorners are a well-known design pattern that is often used in AOP (aspect-oriented programming) scenarios, with more classic insert logs, performance tests, transaction processing, Web permissions checks,

in many cases, such as writing a paper, such as writing a report, such as PPT, need to spend a lot of a lot of graphs, convincing others that data visualization is human instinct. If the reader you are unfortunate, like I do not use MATLAB and other

A class property is a variable belonging to a class, like a static member variable of a class in C + +, you simply define the property in the domain of all methods, that is, the class property, but usually immediately following the class name, the

Import datetimeImport timeString to DateTime str = ' 2012-11-19 ' Date_time = Datetime.datetime.strptime (str, '%y-%m-%d ') Date_time Datetime.datetime (2012,11,19,0,0)DateTime Turn String

Python computing Newton Iteration polynomial instance analysis, python instance analysis This article describes how to calculate the Newton Iteration polynomial using python. Share it with you for your reference. The specific implementation method

Compile a Python script to download the topnexus wallpaper tutorial in batches. Topnexus is my favorite wallpaper download website. There are many high-quality wallpapers on it, which are required almost every day and will be shared every

Use Python to traverse dll files on drive C, The fnmatch of python is really worry-free. Compared with the FilenameFilter in java, it is really much better. You don't need to implement any interfaces to complete it. Fnmatch works with OS. walk ()

Use the mechanism module in Python to simulate the browser function. It is usually useful to know how to quickly instantiate a browser in a command line or python script.Every time I need to do any Automatic web tasks, I use this python code to

Factorial Solved Problem code: FCTRL, factorialfctrl 1 import sys 2 # import psyco # It is very strange that psyco is used to solve the runtime error 3 4 5 # psyco. full () 6 7 8 def z (n): # This should be a skillful algorithm 9 r = 010 while 5 /

Python Urllib library basic usage tutorial, pythonurllib 1. Pull a webpage in minutes How to obtain webpages? In fact, the webpage information is obtained based on the URL. Although we see a beautiful picture in the browser, it is actually presented

Compile a simple timer in Python and a timer in python. The following describes how to implement a timer using the threading module. First, we will introduce a simple implementation: import threadingdef say_sth(str): print str t = threading.Timer(2

Python learns Day 9 property multi-inheritance Mixin, pythonmixin When binding an attribute, If we expose the attribute directly, although it is easy to write, but we cannot check the parameter, so we can change the score as needed: s =

Python xlrd can be used to read the excel date type. There is an excle table that needs to be filtered and written to the database, but the cell of the date type is a number, so the solution is queried. Basic code structureCopy codeThe Code is as

Several data structures in the python collection module (Counter, OrderedDict, namedtup) The collection module has several data structures that we may use. Counter is a sub-class of the dictionary and is responsible for counting a dictionary. It

Python simple process lock code instance, python instance Let's talk about threads first In multithreading, thread synchronization is often used to ensure the correctness of shared resources.Convert some sensitive operations into atomic operations

Use modules in Python and python Python itself has many built-in very useful modules, which can be used immediately after installation. The built-in sys module is used as an example to compile a hello module: #!/usr/bin/env python# -*- coding: utf-8

Set the variable access permission in Python. In the Class, attributes and methods can be available, while external code can directly call the method of instance variables to operate data, thus hiding the internal complex logic. However, from the

Use the Python Tornado framework to implement a one-to-one chat program, pythontornado Chat by train of thought: Similarly, click a user to go to the one-to-one chat page. The chat box list contains all one-to-one chat boxes with chat records. Click