Tutorial by Examples: d

class Card: special_names = {1:'Ace', 11:'Jack', 12:'Queen', 13:'King'} def __init__(self, suit, pips): self.suit = suit self.pips = pips # Called when instance is converted to a string via str() # Examples: # print(card1) # print(str(card1) ...

In simple terms: UNION joins 2 result sets while removing duplicates from the result set UNION ALL joins 2 result sets without attempting to remove duplicates One mistake many people make is to use a UNION when they do not need to have the duplicates removed. The additional performance cost...

Ionic uses Gulp, so install gulp-babel and gulp-plumber. npm install --save-dev gulp-babel gulp-plumber Add babel to gulpfile.js like so: //... var babel = require("gulp-babel"); var plumber = require("gulp-plumber"); var paths = { es6: ['./src/es6/*.js'], sass: ...

QModelIndex does not actually know about it's parent/child indexes, it only contains a row, a column and a pointer, and it is the models responsibility to use this data to provide information an index's relations. The model therefore needs to do a lot of conversions from the void* stored inside the ...

Sometimes you have to deal with structures defined in terms of C data types from Perl. One such application is the creation of raw network packets, in case you want to do something fancier than what the regular socket API has to offer. This is just what pack() (and unpack() of course) is there for. ...

C# using OpenQA.Selenium; using OpenQA.Selenium.Firefox; using OpenQA.Selenium.Interactions; namespace WebDriverActions { class WebDriverTest { static void Main() { IWebDriver driver = new FirefoxDriver(); driver.Navigate().GoToUrl(&quot...

#!/bin/bash #Print Date / Time in different Formats date1=$(date +'%d-%m-%y') date2=$(date +'%d-%m-%Y') date3=$(date +'%d-%b-%Y') date4=$(date +'%d-%B-%Y') date5=$(date +'%a %d-%b-%Y') date6=$(date +'%a %d-%b-%Y %Z') date7=$(date +'%A %d-%b-%Y') echo "Print Date in different forma...

The igraph package for R is a wonderful tool that can be used to model networks, both real and virtual, with simplicity. This example is meant to demonstrate how to create two simple network graphs using the igraph package within R v.3.2.3. Non-Directed Network The network is created with this pie...

One of the most straight forward way of making an LED blink is: turn it on, wait a bit, turn it off, wait again, and repeat endlessly: // set constants for blinking the built-in LED at 1 Hz #define OUTPIN LED_BUILTIN #define PERIOD 500 void setup() { pinMode(OUTPIN, OUTPUT); // sets t...

The elapsedMillis library provides a class with the same name that keeps track of the time that passed since it was created or set to a certain value: #include <elapsedMillis.h> #define OUTPIN LED_BUILTIN #define PERIOD 500 elapsedMillis ledTime; bool ledState = false; void setup...

#include <elapsedMillis.h> void setup() { Serial.begin(115200); elapsedMillis msTimer; elapsedMicros usTimer; long int dt = 500; delay(dt); long int us = usTimer; long int ms = msTimer; Serial.print("delay(");Serial.print(dt);Serial.println(") to...

An example to perform login test based on Page object pattern: import org.openqa.selenium.WebDriver; import org.openqa.selenium.WebElement; import org.openqa.selenium.support.FindBy; import org.openqa.selenium.support.PageFactory; /** * Class which models the view of Sign-In page */ publ...

$ cat ip.txt address range substitution 1234 search pattern sample Add Sub Mul Div Deleting lines other than address specified $ sed '/[0-9]/!d' ip.txt 1234 $ sed -n '/[0-9]/p' ip.txt 1234 $ sed '$!d' ip.txt Add Sub Mul Div $ sed -n '$p' ip.txt Add Sub Mul Div ...

A model by default will use an auto incrementing (integer) primary key. This will give you a sequence of keys 1, 2, 3. Different primary key types can be set on a model with a small alterations to the model. A UUID is a universally unique identifier, this is 32 character random identifier which ca...

.default-settings() { padding: 4px; margin: 4px; font-size: 16px; border: 1px solid gray; } #demo { .default-settings; } The above example when compiled would only produce the following output. The .default-settings() mixin definition would not be output in the compiled CSS fi...

This trick helps you select an element using the ID as a value for an attribute selector to avoid the high specificity of the ID selector. HTML: <div id="element">...</div> CSS #element { ... } /* High specificity will override many selectors */ [id="element&quo...

Traditional way interface MathOperation{ boolean unaryOperation(int num); } public class LambdaTry { public static void main(String[] args) { MathOperation isEven = new MathOperation() { @Override public boolean unaryOperation(int num) { ...

A simple EntitySystem that processes each entity of a given family in the order specified by a comparator and calls processEntity() for each entity every time the EntitySystem is updated. This is really just a convenience class as rendering systems tend to iterate over a list of entities in a sort...

One can verify whether a method was called on a mock by using Mockito.verify(). Original mock = Mockito.mock(Original.class); String param1 = "Expected param value"; int param2 = 100; // Expected param value //Do something with mock //Verify if mock was used properly Mockito.veri...

Our first element directive will not do much: it will just calculate 2+2 and will be called in html like this: <my-calculator></my-calculator> Notice the name of the directive is myCalculator (in CamelCase), but in html it's used as my-calculator (in lisp-case). Since we want our di...