Tutorial by Examples: p

Imagine you have the following HTML: <div> <label>Name:</label> John Smith </div> And you need to locate the text "John Smith" after the label element. In this case, you can locate the label element by text and then use .next_sibling property: from ...

BeautifulSoup has a limited support for CSS selectors, but covers most commonly used ones. Use select() method to find multiple elements and select_one() to find a single element. Basic example: from bs4 import BeautifulSoup data = """ <ul> <li class="item&quo...

This example was done in order to demonstrate how you can perform a deep filter in a child array without the necessity of a custom filter. Controller: (function() { "use strict"; angular .module('app', []) .controller('mainCtrl', mainCtrl); function mainCtrl() { ...

Download a distributed archive from Binaries section of JMeter from Download Apache JMeter page. Depending on the version you downloaded, check minimal Java version requirements and install Java if needed. Ensure the JAVA_HOME environment variable is set and points to a correct version. ...

demoApp.directive('demoDirective', function () { var directiveDefinitionObject = { multiElement: priority: terminal: scope: {}, bindToController: {}, controller: controllerAs: require: restrict: templateNamespace: template: templateU...

.SD .SD refers to the subset of the data.table for each group, excluding all columns used in by. .SD along with lapply can be used to apply any function to multiple columns by group in a data.table We will continue using the same built-in dataset, mtcars: mtcars = data.table(mtcars) # Let's not ...

SyncAdapter /** * Define a sync adapter for the app. * <p/> * <p>This class is instantiated in {@link SyncService}, which also binds SyncAdapter to the system. * SyncAdapter should only be initialized in SyncService, never anywhere else. * <p/> * <p>The system ca...

Sometimes it is appropriate to use an immutable empty collection. The Collections class provides methods to get such collections in an efficient way: List<String> anEmptyList = Collections.emptyList(); Map<Integer, Date> anEmptyMap = Collections.emptyMap(); Set<Number> anEmptySe...

In Julia, the @show macro is often useful for debugging purposes. It displays both the expression to be evaluated and its result, finally returning the value of the result: julia> @show 1 + 1 1 + 1 = 2 2 It is straightforward to create our own version of @show: julia> macro myshow(exp...

A pure function is a function that, given the same input, will always return the same output and are side-effect free. // This is a pure function function add($a, $b) { return $a + $b; } Some side-effects are changing the filesystem, interacting with databases, printing to the screen. //...

The INITCAP function converts the case of a string so that each word starts with a capital letter and all subsequent letters are in lowercase. SELECT INITCAP('HELLO mr macdonald!') AS NEW FROM dual; Output NEW ------------------- Hello Mr Macdonald!

There are a number of different ways to install the AWS CLI on your machine, depending on what operating system and environment you are using: On Microsoft Windows – use the MSI installer. On Linux, OS X, or Unix – use pip (a package manager for Python software) or install manually with the bundle...

void doSomething(String... strings) { for (String s : strings) { System.out.println(s); } } The three periods after the final parameter's type indicate that the final argument may be passed as an array or as a sequence of arguments. Varargs can be used only in the final argume...

Builtin container comes with a set of builtin features : Lifetime control public void ConfigureServices(IServiceCollection services) { // ... services.AddTransient<ITestService, TestService>(); // or services.AddScoped<ITestService, TestSer...

Once registered a dependency can be retrieved by adding parameters on the Controller constructor. // ... using System; using Microsoft.Extensions.DependencyInjection; namespace Core.Controllers { public class HomeController : Controller { public HomeController(ITestServic...

Named functions function multiply(a, b) { return a * b; } Anonymous functions let multiply = function(a, b) { return a * b; }; Lambda / arrow functions let multiply = (a, b) => { return a * b; };

It's possible to create a new ASP.NET Core project entirely from the command line using the dotnet command. dotnet new web dotnet restore dotnet run dotnet new web scaffolds a new "empty" web project. The web parameter tells the dotnet tool to use the ASP.NET Core Empty template. Use...

With C++11 and higher calculations at compile time can be much easier. For example calculating the power of a given number at compile time will be following: template <typename T> constexpr T calculatePower(T value, unsigned power) { return power == 0 ? 1 : value * calculatePower(value,...

Haskell is a pure language, meaning that expressions cannot have side effects. A side effect is anything that the expression or function does other than produce a value, for example, modify a global counter or print to standard output. In Haskell, side-effectful computations (specifically, those wh...

Here is how to make a Heads Up Notification for capable devices, and use a Ticker for older devices. // Tapping the Notification will open up MainActivity Intent i = new Intent(this, MainActivity.class); // an action to use later // defined as an app constant: // public static final String ME...