Python

Python, like other programming languages, also has three program structures. Sequential structure, select structure, loop structure.1. Sequential structureThe sequential structure executes the program in sequence and does not explain too much.2.

Progressive representation1, progressive representation: O Omega Theta, some algorithms can not be represented by Theta.2. Graph notation: adjacency list, adjacency matrix. means to see the use of the occasion.3. Tree notation: two fork Tree class4,

Python Os.path module Common methods detailed1. Os.path.abspath (PATH)Returns the absolute path normalized by path.>>> Import OS>>> os.path.abspath (' Pjc.txt ')'/home/pjc/pjc.txt '>>> os.path.abspath (' c:\\test.csv ') #Windows主机指定完美的路径'

List list=[], such as: member[' 1 ', 2, ' hello ', list can contain different data typesSome common ways to list:add element:Append (), insert a new element at the end of the list, such as Member.append (' Tony '),Extend (), insert a new list at the

Time module:>>>Import Time>>>Time.timeinchfunction time>>>>time.time ()1473837803.320634>>>time.localtime () time.struct_time (Tm_year= ., tm_mon=9, tm_mday= -, tm_hour= the, tm_min= at, tm_sec= -, tm_wday=2, tm_yday=258, tm_isdst=0)>>>time.ctime ()'

Format: @functon#模拟验证功能def Login (auth): def Fun (ARG): #为了避免程序一执行的时候就执行验证, you need to add another layer of function. Print ('Validation Successful') Auth (Arg) #相当于执行home ('Echo') functionreturnFun@logindef Home (name): Print ('Welcome%s to home

Exceptions in Python are handled by try-except [Exceptionname] blocks, for example:Def some_function ():Try# Division by zero raises an exception10/0Except Zerodivisionerror:Print "Oops, invalid."Else# Exception didn ' t occur, we ' re

1, locals () and Globals () are Python's built-in functions that provide a dictionary of ways to access local variables and global variables.Example code:1 defTest (ARG):2A=13b=24Data_dict = {}5 Printlocals ()6 PrintGlobals ()7 8 9 if __name_

1 #!/usr/bin/env python2 #-*-coding:utf-8-*-3 4 ImportQueue5 ImportThreading6 ImportContextlib7 Import Time8 9Stopevent =object ()Ten One A classThreadPool (object): - - def __init__(Self, max_num, max_task_num =None): the

Processes, Threads Process: One execution of a programThreads: Basic scheduling Unit for CPUsEach process provides the resources needed to execute the program. A process has a virtual address space, execute code, open handle system

Reference:https://docs.python.org/2/library/collections.html Namedtuple () Factory function for creating tuple subclasses with named fields Deque List-like container with Fast appends and POPs on either end

Python insert sorting and python insert sorting Insert sorting summary: Sample Code: Array = [3, 4, 1, 6, 2, 9, 7, 0, 8, 5] # insert_sortfor I in range (1, len (array )): if array [I-1]> array [I]: temp = array [I] # index = I #, the element to

Python batch scan server port 80 Status, python scan port 80 I wrote a simple Port Scan script in Python. The simple logic is as follows: 1. python DetectHostPort. py iplist.txt (stores the text of the IP address list to be scanned, one address per

Teach you to develop a python module in minutes (1)-a method that can be printed directly in a browser, python Module Once, those who used the python print command were amazed at the streamlining of the python syntax. Later, they used web

Python custom class array sorting implementation code, python Array First, write the implementation method, which is actually very simple. You only need a code sentence: Copy codeThe Code is as follows:Productlist. sort (lambda p1, p2: cmp

Use Python to generate images of any size in batches, Effect The source image is used to generate 1000 images in the/img directory of the current working directory, ranging from 1*1 to 1000*1000 pixels. The effect is as follows: Directory

Use Python to obtain operating system information instances and python instances Preface Every O & M personnel should be clear about the machine configuration they manage, because it is very helpful for us to quickly solve the problem. For example,

Let's talk about variable parameters of functions in Python. Preface Define functions in Python. You can use required parameters, default parameters, variable parameters, and keyword parameters. These four parameters can be used together or only

Python code for converting Javascript % u string to python unicode, % upython The data collected by the web is % u6B63 % u5F0F % u4EBA % u5458. You need to read and convert the data to a python object. If you want to call Javascript to eval, you

Special usage of star variable in python, python Asterisk I. What is an asterisk variable? Initially, the asterisk variable is used for parameter transfer of the function. In the following example, a single asterisk indicates that this position