mongodb 3 6 features

minimum elements (Heapq.nlargest and Heapq.nsmallest) >>> a = [Random.randint (0, +) for in xrange (100)] >>> Heapq.nsmallest (5, a) [3, 3, 5, 6, 8] >>> Heapq.nlargest (5, a) [100, 100, 99, 98, 98] 1.31 Cartesian product (itertools.product) >>> for P in Itertools.product ([1, 2, 3], [4, 5]): (1, 4) (1, 5) (2, 4) (2, 5

Objective The previous introduction about what is JSP, today I will introduce you to JSP three instructions, 6 actions and its 9 large built-in objects. Then we'll go straight to the chase. I. 3 Instructions for JSP JSP directives (Directive) are designed for the JSP engine, and they do not directly produce any visible output, but simply tell the engine how to handle the rest of the JS

": [ { "role": "Useradminanydatabase", "DB" : "Admin" } ] } The above is the command to execute: User: Username PWD: Password Roles: Specifies the role of the user, an empty array can be used to set the null role for the new user; In the Roles field, you can specify built-in roles and user-defined roles. Roles in role can be selected: Built-in Roles (built-in role): 1. Database user role: Read, readWrite; 2. Database management roles: DbAdmi

things and want to clearly describe them, we have to repeat a lot of information? The same is true for the page language. In this case, the page language is messy and difficult to understand. By integrating the language that controls the display effect into CSS, we can not only ensure the simplicity of the main part of the page language, but also easily reuse various language sets. HTML5 and CSS3 are the latest versions of HTML and CSS. They are not yet standardized, but the new

gridview configuration as follows. 1 Form ID = "Form1" Runat = "Server" > 2 Div > 3 ASP: gridview ID = "Gridview_users" Runat = "Server" Itemtype = "Modelbinding. Users" 4 Datakeynames = "Userid" Selectmethod = "Getusers" 5 Autogeneratecolumns = "False" > 6 Columns > 7 ASP: boundfield Datafield = "Userid" Headert

The reason for the establishment of the SWIG project is to provide simple and natural scripting language interfaces for everyone. What is concise and natural? It means that C/C ++ functions are directly encapsulated into python functions, and classes are encapsulated into python classes. In this way, it will not change. The following describes some basic C/C ++ features supported by SWIG. 1 Function Function is the source of code reuse. SWIG encapsula

are a few points to note: (1) When declaring a reference, it must be initialized immediately, cannot be declared after the assignment: such as int x=10;int y;y=x; (2) The type of the reference must be the same as the type of the variable to which it is assigned, not: int X;double y=x; (3) The value provided for the reference, which can be a variable or a reference: int x=5;int y=x;int z=y; (4) Reference cannot be re-declared as another variable after

Interoperability Series Article : . Net short talk about interoperability (1: Introduction At the beginning) . Net short talk about interoperability (2: Faster first) . Net short talk about interoperability (3: Basic knowledge of dllimport features) . Net short talk about interoperability (4: releasing unmanaged memory with basic knowledge) . Net short talk about interoperability (5: Bas

New feature 3 of Oracle12c-enhanced management functions and new features of oracle12c 1. Online renaming and migration of data files In Oracle12cR1, migration or renaming of data files does not require a series of steps. For example, you need to change the tablespace to read-only mode and then perform operations such as data file logic. In 12cR1, data files can be easily completed online using the SQL stat

Entity Framework 6 Recipes translation Series 3, entityframeworkChapter 2 basis of Object Data Modeling It is very likely that you start to explore the Entity Framework. You may ask "How do we start ?", If this is the case, this chapter is a good start. If not, you have already modeled and feel good about entity splitting and inheritance, you can skip this chapter. This chapter describes the basic examples

Uncover new features of SQL Server 2014 (3)-updatable column storage clustered index, Introduction The column storage index actually exists in SQL Server 2012, but SQL Server 2012 only allows the creation of non-clustered column indexes, this means that the column index references the underlying data on the original Row Storage index, which consumes more storage space, but the biggest limit in 2012 is that

Advanced FeaturesOne, slice1, taking a list or a tuple element is a very common operation, Python provides the slice (Slice) operator, can greatly simplify this operation. For example a list: L = [ " michael , " sarah , " tracy , " bob , " jack "] Take the first three elements: L[0:3] . The output is: ['Michael', 'Sarah', 'Tracy ']L[0:3] indicates that the fetch starts at index 0 until index

ArticleDirectory Use the $. Each () and. Each () Methods Date: 2012-6-22 Source: gbin1.com Today, we will continue to introduce Part 3. If you have not read the previous article, click the following link to view it: Gbin1 online instances help you better understand jquery features (1) The gbin1 online instance helps you better understand jquery

Geoserver learning note (6): Part 3 of Servlet and HTTP distribution process Su Weimin http://www.gisdev.cn/http://blog.csdn.net/suen/ Date: All copyrights reserved. If you need to reprint the information, contact the author and indicate the source in a conspicuous position. Followed by the geoserver learning notes (5): Servlet and HTTP dispatching process II (http://blog.csdn.net/suen/archive/2009/11/02/47

Document directory 1. Used to disable CSS of controls 2. Used to verify the CSS of the control 3. used to hide the css of the field Div Element 4. CSS for the Table, Image, and ImageButton controls 5. CSS for UpdatePanel and UpdateProgress controls 6. eliminate unnecessary External tables 7. layout template of the wizard Control 8. Added HTML format setting options for the CheckBoxList and RadioBu

forKvinchD.items ()]3['y=b','X=a','Z=c']1>>> L = ['Hello',' World','IBM','Apple']2>>> [S.lower () forSinchL]3['Hello',' World','IBM','Apple']If the list contains both a string and an integer, there is no method for the non-string type lower() , so the listing generates an error:Use the built-in isinstance function to determine if a variable is a string:1 ' ABC ' 2 >>> y = 1233 >>> isinstance (x, str)4True5

dictionary validation.Create DATABASE Link Option description6) SHARED, not specifiedDo not specify: The default value establishes a dedicated (private) connection, and each local session using Database link will have a session with a remote database.Shared: Create a shared database connection, and specify databases Link_authentication.Database link using shared mode is the number of connections to the remote database that are restricted by the databases so that excessive connections are too st

file (first set syntax mode for HTML) directly input! (represents an HTML document in HTML5 format) and then press ctrl+E .Attached: How to install the package controlctrl+\ View > Show Console Open the console using the shortcut key or menu, and enter the following Python execution code (for python3.x interpreter):Import Urllib.request,os; Pf= ' Package control.sublime-package '; IPP = Sublime.installed_packages_path (); Os.makedirs (IPP) if not os.path.exists (IPP) else None; Urllib.request.i

as hardware raid, and features are not as good as hardware raid. Next we will introduce various RAID technologies I. RAID 0 The band technology is used to write data in parallel on multiple disks in bytes or bits (the starting offset of each disk is the same, and the subsequent segments of a certain number of bytes, i/O read/write performance can be improved, but it does not have data redundancy like raid1. Once the hard disk fails, it will be done.

IOS development features 11: Inter-thread communication (3 methods) and ios3 All three methods are implemented by monitoring the touch of the screen through touchesBegin. 1. performSelector Mode 1 # import "ViewController. h "2 @ interface ViewController () 3 @ property (weak, nonatomic) IBOutlet UIImageView * imageView; 4 @ end 5 @ implementation ViewController