Python

To put it simply, the decorator is mainly used to modify functions. It appears to define static methods when introducing Class methods and static methods. For example, to declare the Foo () function as a static function CopyCode The Code is as

1. For example, if Python advocates a simple and practical idea, it does not have a switch statement. You can write (1) implemented through the IF Elif statement If condition: ... Elif condition: ... Else: ... (2) Pass CopyCode The Code is as

CopyCodeThe Code is as follows: import random Print 'n' must> K else error' N = int (raw_input ("n = ")) K = int (raw_input ("k = ")) Result = [] X = range (N) For I in range (k ): T = random. randint (I, n-1) Temp = x [I] X [I] = x [T] X [

CopyCodeThe Code is as follows: Class entrydemo (FRAME ): "Demonstrate entrys and event binding """ Chosenrange = 2Url_login = "http: //.../ipgw. ipgw /"Uid = ''# User NamePassword = ''# PasswordOperation = ''# operationRange = '2' #

1) doctest Using doctest is similar to a command line attempt. It is easy to use as follows: CopyCode The Code is as follows: def F (n ): """ >>> F (1) 1 >>> F (2) 2 """ Print (N) If _ name _ = '_ main __':Import doctestDoctest. testmod ()

Python file: CopyCode The Code is as follows: # parsexml. py # In this example, the python online document has been modified and added. Import XML. parsers. Expat # Control print indentationLevel = 0 # Obtain a node name and a set of

1. metacharacters: . It matches any character except the line feed character. In alternate mode (Re. dotall), it can even match the line feed.^ Match the beginning of a row. Unless the multiline flag is set, it only starts to match the string.$

The following is written in Python and uses lxml for HTML analysis. What we can see on the Internet is that the analysis speed is the fastest, but it has not been verified. Okay. Code . Copy code The Code is as follows: Import urllib Import urllib2

Source code: Save it as a UTF-8 Bd. py file CopyCode The Code is as follows :#! /Usr/bin/ENV Python #-*-Coding: UTF-8 -*- Import sys Import urllib, urllib2 Import re Def Baidu (W ): Url = "http://www.baidu.com/s? " Values = { "W": W. encode ('gbk',

1. install and configure the development environment 1.1 prepare for Installation Download the following software Eclipse for C/C ++ Sun JDK 1.6 does not have to be 1.6, and 1.5 does. Python3.1 python2.6.4 pythone2.5.2

Copy codeThe Code is as follows: # coding = UTF-8 Import OSImport sysImport reImport urllib URL_REG = re. compile (R' (http: // [^ //] +) ', re. I)IMG_REG = re. compile (R' ] *? Src = ([/'"]) ([^/1] *?) /1', re. I) Def download (dir, url ):'''

I was going to find an introductory tutorial on the Internet, but since Python is rarely the first time programmers come into contact with the language learned by the program, the existing tutorials on the Internet are not very basic, so I decided

Copy codeThe Code is as follows :#! /Usr/bin/python Import sys Def left_child (node ):Return node * 2 + 1 Def right_child (node ):Return node * 2 + 2 Def parent (node ):If (node % 2 ):Return (I-1)/2Else:Return (I-2)/2 Def max_heapify (array, I,

QUICKSORT (A, p, r) is A subroutine for fast sorting. It calls the division program to divide the array, and then recursively calls QUICKSORT (A, p, r ), to complete the quick sorting process. The worst time complexity of quick sorting is O (n2),

First look at a piece of code: Copy codeThe Code is as follows: class T1 (threading. Thread ): Def _ init _ (self, a, B, c ): Super (T1, self). _ init __() Self. a = Self. B = B Self. c = c Def run (self ):Print self. a, self. B, self. c The Code

Python version More comprehensive functions than the previous xxftp 1. Continue to support multiple users 2. Support for virtual directories 3. Added permission settings that support user root directories and ing virtual directories. 4. Added

Open the dos window and execute the python program. Add the raw_input () statement after the last line of the script, so that the window is closed until the Enter key is pressed. Use the sleep function of the time module. It has a parameter that

Core code: Copy codeThe Code is as follows :#! /Usr/bin/env python #-*-Coding: UTF-8 -*- From bisect import bisect _ LIST1, _ LIST2 = [], []_ INIT = False Ip2int = lambda ip_str: reduce (lambda a, B: (a Def _ init ():Global _ LIST, _ INITIf not _

List Parsing You can use list resolution when you need to change the list instead of creating a new list. The list parsing expression is: [Expr for iter_var in iterable] [expr for iter_var in iterable if cond_expr]First, iterate all the content in

The following defines a function: Copy codeThe Code is as follows: def foo (): Print ('function ') Foo () In the above Code, a function named foo is defined, which has no parameters. The function of the last line of code is to call this function.