Tutorial by Examples: g

The creators of Swift have put a lot of attention into making the language expressive and error handling is exactly that, expressive. If you try to invoke a function that can throw an error, the function call needs to be preceded by the try keyword. The try keyword isn't magical. All it does, is mak...

The connection between the widget and the scrollbar goes both ways. The scrollbar needs to be expanded vertically so that it has the same height as the widget. text = tk.Text(parent) text.pack(side="left") scroll_y = tk.Scrollbar(parent, orient="vertical", command=text.yview...

The principle is essentially the same as for the Text widget, but a Grid layout is used to put the scrollbars around the widget. canvas = tk.Canvas(parent, width=150, height=150) canvas.create_oval(10, 10, 20, 20, fill="red") canvas.create_oval(200, 200, 220, 220, fill="blue")...

In this example, one of two different ImageViews should be translated from the ChooserFragment to the DetailFragment. In the ChooserFragment layout we need the unique transitionName attributes: <ImageView android:id="@+id/image_first" android:layout_width="wrap_content...

It has not been explained in the Tensorflow documentation how to load images and labels directly from a TXT file. The code below illustrates how I achieved it. However, it does not mean that is the best way to do it and that this way will help in further steps. For instance, I'm loading the labels ...

Django 1.9 added the Field.disabled attribute: The disabled boolean argument, when set to True, disables a form field using the disabled HTML attribute so that it won’t be editable by users. Even if a user tampers with the field’s value submitted to the server, it will be ignored in favor of t...

Progress ABL code is normally stored in files with different ending depending on what they contain. The endings are optional but rather a defacto standard: Filename extensionContains.pA Progress program. Can contain several internal procedures, functions etc.iInclude file to be included in other fi...

GameScene code example: import SpriteKit protocol GameViewControllerDelegate: class { func callMethod(inputProperty:String) } class GameScene: SKScene { weak var gameViewControllerDelegate:GameViewControllerDelegate? override func didMove(to view: SKView) { gameViewContro...

Navigate to phpMyAdmin by URL http://your_ip/phpmyadmin or http://localhost/phpmyadmin Login using username root and root password. Click on Databases tab. Enter database name, select collation (you may leave it to default) and click create. Click on Privileges tab and select "Add user a...

$ grep root /etc/passwd root:x:0:0:root:/root:/bin/bash operator:x:11:0:operator:/root:/sbin/nologin

$ egrep '^(0|1)+ [a-zA-Z]+$' searchfile.txt 011 AaBBS

$ fgrep "." .bashrc # will match lines with a dot.

$ pgrep python 1299

From the tool-bar open the Java Perspective. Create a new Java project Right-click into the Package Explorer, and from the menu select New -> Java Project In the upcoming dialog enter a project name, then click Finish. Now you have the new project in your workspace. Create a new Java ...

In Python 3.6, PEP 487 added the __init_subclass__ special method, which simplifies and extends class customization without using metaclasses. Consequently, this feature allows for creating simple plugins. Here we demonstrate this feature by modifying a prior example: Python 3.x3.6 class Base: ...

Sub TransposeRangeValues() Dim TmpArray() As Variant, FromRange as Range, ToRange as Range set FromRange = Sheets("Sheet1").Range("a1:a12") 'Worksheets(1).Range("a1:p1") set ToRange = ThisWorkbook.Sheets("Sheet1").Range("a1")...

Open Function.cs and replace the class code with the following: public class Function { /// <summary> /// A simple function that takes a birth date and returns Age in years /// </summary> /// <param name="input"></param> /// <returns>Age is years&...

This example assumes you have a servo with the following characteristics, which happen to be typical: movement between 0 and 180 degrees pulse period of 20 ms minimum pulse length of 0.5 ms maximum pulse length of 2.5 ms You need to check if those values match your hardware, since forcing i...

Reagent atoms are essentially the same as regular atoms in both Clojure and ClojureScript - they are essentially variables that can be altered. This is especially useful, as Clojure(Script)'s data types are mostly immutable - which means that to change the value of a variable, the variable has to be...

Instances of Integer_IO have a settings variable Default_Width which the number of characters that each output number will take. with Ada.Text_IO; use Ada.Text_IO; procedure Print_Integer is subtype Count is Integer range -1_000_000 .. 1_000_000; package Count_IO is new Integer_IO ...