Python

Pattern = re. Compile(' .*? (. *?) .*?+ ' content ' > (. *?) .*? (. *?) (. *?) ',re. S) Now the regular expression is a little bit more descriptive here.1). *? is a fixed collocation,. and * representatives can match any infinite number of

I am a person who likes it, and I have paid a lot for it. Stay up late to solve the problem on the network, self-taught Linux, although not a master, but to deal with the company's Linux server environment is not a problem, but my disadvantage is

I. iteratorsIterators are a way to access the elements of a collection. The iterator object is accessed from the first element of the collection until all of the elements have been accessed and finished. Iterators can only move forward without going

Four, the regular expression    Strings are the most data structure involved in programming, and the need to manipulate strings is almost ubiquitous. For example, to determine whether a string is a legitimate email address, although it can be

Interpreter Environment and options[[email protected] ~]# python-c ' print ' Hello 'HelloPython Interpreter Environment variablesPython document stringIf the first row of a function, class, or module is a string, the string becomes a document string

First introduce the next I, my name is Du Chu, alias is also called Ancient capital Autumn, network engineering graduate, is an e-commerce company, has been three years, at first from a small network management, a router, a switch, the following

Recently in the Leetcode brush problem, obviously notice the same algorithm, Python run much slower, check data get Python run slow main reasons are as follows:First, the dynamic type causes the running speed is slow, in the Bupt person forum inside

Python list tuplesIndex tile Append Delete length loop contains define a listMy_list = []My_list = List () my_list = [' Michael ', ' Bob ', ' Tracy ']len (my_list) Gets the number of elements list is a mutable ordered list, so define the element

#descriptionThe following small program is like the life of Linux tail-f/var/log/messages, when the runtime can dynamically display the text file in the information Oh!Import TimeImportSYSImportOSdeftail (f): F.seek (0,2)#跳转到文本文件的最后的位置

Closure concept:Closure: References to variables in enclosing scope in intrinsic functionsEnclosing scope: between function interior and embedded letterExample 1:#Coding:utf-8defSet_passline (passline):defCMP (val):ifval>=Passline:Print "Passline is%

One, iteratorIterators are a way to access the elements of a collection. The iterator object is accessed from the first element of the collection until all of the elements have been accessed and finished. Iterators can only move forward without

1. Create a dictionary with {}Code: 12 x ={"a":"1", "b":"2"}printx Output:{' A ': ' 1 ', ' B ': ' 2 '}2, with the built-in function dict () 1), the entry parameter is similar to a= "1" the key value pairCode:

Directory structure:The myfile1.py, myfile2.py, myfile3.py codes are print filenames and __name__ variables, such as myfile1.py:1 Print ("myfile1",__name__)index.py Import imports the above three files and prints the __name__ variable, the code is

New list, new string string1Li1 = [1, 2, 3, 4]2Li2 = List ([1, 2, 3])3 4S1 ="ABC"5S2 = str ("ABC")6 7 Print(LI1)8 Print(Type (LI1))9 Ten Print(LI2) One A Print(S1, S2) - - #Show Results: the #[1, 2, 3, 4] - # - #[1, 2, 3] - #ABC abcLi1 Li2 objects

Conversion of Python strings, tuples, lists, and dictionaries. I am not talking about this nonsense. I am posting Code directly to you. If the code is not well written, I 'd like to forgive you. #-*-Coding: UTF-8-*-#1. dictionary dict = {'name':

How to configure vim and 15.10vim on ubuntu 15.10 In Python Development 1. Install vim. you can install it using the apt-get tool that comes with ubuntu. Apt-get install vim-gnome 2. After the installation is successful, configure 1> first, perform

Variable scope and pythonscope in Python Http://www.crifan.com/summary_python_variable_effective_scope/   Explain the scope of variables in python Example: 1. Code version 1 #! /Usr/bin/python 2 #-*-coding: UTF-8-*-3 "4 bytes 5 Function: 6

Compile a Python crawler to capture the TOP100 and user avatar of a Douban movie, pythontop100 Capture Douban movies TOP100I. Analyze the Douban top page and build the program structure1. First open the Web http://movie.douban.com/top250? Start,

Describes how to use the Python crawler Beautiful Soup and pythonsoup 1. Install BeautifulSoup4Easy_install easy_install beautifulsoup4 Pip installation method. pip also needs to be installed in advance. In addition, there is a package named

Python list sorting Method reverse, sort, sorted details, reversesorted There are three list sorting methods in python: reverse/reverse sorting by reverse, forward sorting by sort, and sorted. In more advanced list sorting, you can add condition