Tutorial by Examples: r

To find the largest items in a collection, heapq module has a function called nlargest, we pass it two arguments, the first one is the number of items that we want to retrieve, the second one is the collection name: import heapq numbers = [1, 4, 2, 100, 20, 50, 32, 200, 150, 8] print(heapq.nl...

Let's create a very simple view to respond a "Hello World" template in html format. To do that go to my_project/my_app/views.py (Here we are housing our view functions) and add the following view: from django.http import HttpResponse def hello_world(request): html = "&lt...

The default Django project template is fine but once you get to deploy your code and for example devops put their hands on the project things get messy. What you can do is separate your source code from the rest that is required to be in your repository. You can find a usable Django project templ...

Sometimes, you want to add listeners on particular events not natively provided by the components, in particular mouse events. To do so, you will have to add them by yourself using an EventTrigger component : using UnityEngine; using UnityEngine.EventSystems; [RequireComponent(typeof( EventTrig...

Options have a flatMap method. This means they can be used in a for comprehension. In this way we can lift regular functions to work on Options without having to redefine them. val firstOption: Option[Int] = Option(1) val secondOption: Option[Int] = Option(2) val myResult = for { firstValue ...

Dim classFile : classFile = "carClass.vbs" Dim fsObj : Set fsObj = CreateObject("Scripting.FileSystemObject") Dim vbsFile : Set vbsFile = fsObj.OpenTextFile(classFile, 1, False) Dim myFunctionsStr : myFunctionsStr = vbsFile.ReadAll vbsFile.Close Set vbsFile = Nothing Set fs...

Sample uses Install-Package Google.Apis.AnalyticsReporting.v4 Public Shared Function getServiceInitializer() As BaseClientService Dim serviceAccountCredentialFilePath = "Path to Json service account key file" REM from Google Developers console Dim myKeyEMail ...

@Configuration @EnableAsync public class ApplicationConfiguration{ @Bean public TaskExecutor getAsyncExecutor() { ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor(); executor.setCorePoolSize(2); executor.setThreadNamePrefix("executor-task...

Let say you want to create css/js file specific to a platform. For that you have to create a merges folder in root folder of you cordova porject. In merges folder create directory for each platform (android/ios..). then in specific platform folder create a css/js folder and put your css/js file spec...

/* * This example show some ways of using std::function to call * a) C-like function * b) class-member function * c) operator() * d) lambda function * * Function call can be made: * a) with right arguments * b) argumens with different order, types and count */ #include &lt...

Some programs need so store arguments for future calling of some function. This example shows how to call any function with arguments stored in std::tuple #include <iostream> #include <functional> #include <tuple> #include <iostream> // simple function to be called d...

In the following example there are 2 Screens: SettingsScreen and MenuScreen Using the first button, on the current screen will change your screen to the other screen. Here is the code: from kivy.app import App from kivy.lang import Builder from kivy.uix.screenmanager import ScreenManager, Scr...

Detailed instructions on getting eloquent set up or installed.

public async Task<actionresult> Index() { return View("View", await db.UserMasers.ToListAsync()); }

Typescript supports costant enumerables, declared through const enum. This is usually just syntax sugar as the costant enums are inlined in compiled JavaScript. For instance the following code const enum Tristate { True, False, Unknown } var something = Tristate.True; compil...

The ConstainsKey method is the way to know if a key already exists in the Dictionary. This come in handy for data reduction. In the sample below, each time we encountner a new word, we add it as a key in the dictionary, else we increment the counter for this specific word. Dim dic As IDictionary(...

Pancake Sort is a the colloquial term for the mathematical problem of sorting a disordered stack of pancakes in order of size when a spatula can be inserted at any point in the stack and used to flip all pancakes above it. A pancake number is the minimum number of flips required for a given number o...

You can use a TStringList to store Key-Value pairs. This can be useful if you want to store settings, for example. A settings consists of a Key (The Identifier of the setting) and the value. Each Key-Value pair is stored in one line of the StringList in Key=Value format. procedure Demo(const FileN...

The Caesar cipher is a classic encryption method. It works by shifting the characters by a certain amount. For example, if we choose a shift of 3, A will become D and E will become H. The following text has been encrypted using a 23 shift. THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG QEB NRFZH YOL...

ROT13 is a special case of Caesar cipher, with a 13 shift. Only letters are changed, and white-space and special characters are left as they are. What is interesting is that ROT13 is a reciprocal cipher : applying ROT13 twice will give you the initial input. Indeed, 2 * 13 = 26, the number of lette...