__getattriubte__ is a built-in method in Python that is used to access attributes of an object. It is invoked when an attribute is not found in the usual places such as the object's namespace or its classes. Instead of raising an AttributeError, the __getattriubte__ method allows you to customize the behavior of attribute access.

Here's an example:

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class Person:
    def __getattriubte__(self, name):
        print(f"{name} attribute does not exist")

person = Person()
person.age

Output:

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age attribute does not exist

In this example, when trying to access the age attribute of the Person object, since it doesn't exist, the __getattriubte__ method is called and it prints a message indicating that the attribute does not exist.

Yes, the SheCodes classes are conducted online. Students can access the course materials and participate in the classes from anywhere with an internet connection.

Abstraction is an important concept in Object Oriented Programming (OOP) as it allows us to hide away implementation details and expose only what is necessary to the user.

In TypeScript, we can create abstract classes and abstract methods to achieve abstraction.

An abstract class cannot be instantiated directly, but it can be inherited by other classes. Abstract classes can have both abstract and non-abstract methods.

Here is an example of an abstract class in TypeScript:

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abstract class Animal {
  abstract makeSound(): void; // abstract method

  move(): void { // non-abstract method
    console.log("Roaming the earth...");
  }
}

In this example, Animal is an abstract class and makeSound is an abstract method. This means that any class that inherits from Animal must implement their own version of makeSound.

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class Cat extends Animal {
  makeSound() {
    console.log("Meow!");
  }
}

const myCat = new Cat();

myCat.makeSound(); // Output: "Meow!"
myCat.move(); // Output: "Roaming the earth..."

Here, Cat is a subclass of Animal and implements its own makeSound method. The move method is inherited from the Animal class.

In summary, abstraction in OOP allows us to hide implementation details and expose only what is necessary to the user. In TypeScript, we can achieve this by using abstract classes and methods.

This is a task that requires more detailed explanations and it involves creating multiple classes and forms. Here is an outline of the steps you could follow:

1. Create a class named Airport which will hold the information about an airport such as name, city, country, and whether it's open or closed. Also, include a property that has a list of 20 planes for that airport.

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public class Airport {
   public string Name { get; set; }
   public string City { get; set; }
   public string Country { get; set; }
   public bool IsOpen { get; set; }
   public List<Plane> Planes { get; set; }
   // ...
}

1. Create a Plane class that includes properties for plane's model, serial number, maintenance date, and passenger capacity.

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public class Plane {
   public string ModelNumber { get; set; }
   public string SerialNumber { get; set; }
   public DateTime MaintenanceDate { get; set; }
   public int PassengerCapacity { get; set; }
   // ...
}

1. Create a form that displays a combo box of countries. Once a country is selected, populate another combo box with its cities, and when a city is selected, populate another combo box with its airports.

2. When the airport is selected, display the details of the selected airport, including the list of planes and their details.

3. When the user selects a plane, the form should display its details.

4. When the user tries to book a ticket, check if there is enough space on the plane. If yes, update the plane's passenger count and save the changes. If no, display an error message.

Keep in mind that this is just a rough outline of what the program should look like. It is recommended that you further research and break down the tasks into smaller, more manageable parts. Here are a few resources that you might find helpful:

• C# Windows Forms Application tutorial: https://docs.microsoft.com/en-us/dotnet/desktop/winforms/getting-started/
• How to use combo boxes: https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.combobox
• Working with classes in C#: https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/classes

To label HTML classes, you use the "class" attribute. In the opening tag of the HTML element that you want to label, you add the "class" attribute followed by an equal sign and a double-quoted string that serves as the label name. For example:

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<div class="my-class"> This div has the "my-class" label. </div>

In the above code snippet, the class "my-class" is added to the "div" element. This allows you to target and style specific elements using CSS.

To use HTML classes, you first need to define a class in the HTML file or a separate CSS file. You can define a class with the class attribute followed by a name of your choice.

Here's an example of how to define a class in HTML:

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<style>
  .highlight {
    color: red;
    font-size: 18px;
    font-weight: bold;
  }
</style>

<p class="highlight">This paragraph will be highlighted!</p>

In the above example, we've defined a class called highlight and added some CSS styles to it. Then, we've applied that class to a p tag using the class attribute.

You can also apply multiple classes by separating class names with a space:

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<p class="highlight bold">This paragraph will be highlighted and bold!</p>

In this case, we've defined two classes (highlight and bold) and applied both of them to the p tag.

To apply the same class to multiple elements, you can use the same class name multiple times:

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<h1 class="heading">Welcome to my website</h1>
<p class="description">This is a website about coding</p>
<div class="box"></div>

<style>
  .heading {
    font-size: 32px;
    font-weight: bold;
  }

  .description {
    font-size: 16px;
    color: gray;
  }

  .box {
    width: 100px;
    height: 100px;
    background-color: blue;
  }
</style>

In this example, we've defined three classes (heading, description, and box) and applied them to different elements.

In CSS, there is no specific "subheading" element. However, you can create subheadings by using different levels of heading tags (h1, h2, h3, etc.) and adjusting their styles using CSS. For example, if you want to style h2 as a subheading of h1, you can use CSS to decrease its font size, change its color, or add margins or padding. Here's an example in CSS:

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h1 {
  /* main heading styles */
}

h2 {
  font-size: 1.2rem; /* smaller font size than h1 */
  color: #555; /* different color than h1 */
  margin-top: 1rem; /* add some space above the subheading */
  /* other subheading styles */
}

You can also use classes or IDs to target specific headings and style them differently. Here's an example of using a class for subheadings:

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<h1>Main Heading</h1>
<h2 class="subheading">Subheading 1</h2>
<h2 class="subheading">Subheading 2</h2>

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.subheading {
  font-size: 1.2rem;
  color: #555;
  margin-top: 1rem;
  /* other subheading styles */
}

To make HTML classes links different colors, you can add CSS properties to your classes. Here's an example code snippet in CSS:

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.link-blue {
  color: blue;
}

.link-green {
  color: green;
}

.link-orange {
  color: orange;
}

In this example, we have three classes: .link-blue, .link-green, and .link-orange each with a different color. You can then add these classes to your HTML links:

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<a href="#" class="link-blue">Blue link</a>
<a href="#" class="link-green">Green link</a>
<a href="#" class="link-orange">Orange link</a>

Each link will have a different color corresponding to the class applied to it. You can change the colors to any other colors of your choice by modifying the color property in the CSS.

I hope that helps! Let me know if you have any other questions.

To adjust three images with different sizes into the same size using Bootstrap, you can use the class img-fluid on each image. This class makes the image responsive and scales it to the size of its container.

Here is an example code snippet in HTML:

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<div class="row">
  <div class="col-md-4">
    <img src="image1.jpg" class="img-fluid" alt="Responsive image">
  </div>
  <div class="col-md-4">
    <img src="image2.jpg" class="img-fluid" alt="Responsive image">
  </div>
  <div class="col-md-4">
    <img src="image3.jpg" class="img-fluid" alt="Responsive image">
  </div>
</div>

In this code, the images are wrapped in a div with the class col-md-4, which makes each image take up one-third of the width of the screen on a medium-sized device. The img-fluid class is applied to each image, which makes them all the same size and responsive.

You can customize the styling by adjusting the Bootstrap grid classes and applying additional CSS as needed.

To enable shadows in Bootstrap, you can use Bootstrap's built-in shadow utility classes.

You can apply shadow to an HTML element by adding the Bootstrap shadow utility class to the element.

For example, you can add a shadow to a button element using the shadow class like this in HTML:

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<button class="btn shadow">Button with shadow</button>

You can also add different levels of shadow by using classes like shadow-sm, shadow-lg, and shadow-none.

Here is an example of how to use the shadow-sm class in an <h1> HTML element:

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<h1 class="shadow-sm">Heading with small shadow</h1>

For more information about Bootstrap's shadow utility classes, you can refer to the official documentation: https://getbootstrap.com/docs/5.0/utilities/shadows/

In Bootstrap, you can fix the position of the navbar by adding the fixed-top class to the <nav> element. This will make the navbar stay at the top of the page even when the user scrolls down.

Here is an example code:

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<nav class="navbar navbar-expand-lg navbar-light bg-light fixed-top">
  <a class="navbar-brand" href="#">Logo</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
    </ul>
  </div>
</nav>

In the above code, the fixed-top class is added to the <nav> element. This will make the navbar stay at the top of the screen when the user scrolls. You can customize the classes and styles according to your needs.

You can check the official Bootstrap documentation for more information and examples: https://getbootstrap.com/docs/4.6/components/navbar/

It seems you're having trouble with Bootstrap columns. Please make sure you're using the correct Bootstrap classes for the column system. Remember that the total sum of columns should add up to 12. Also, check if you have linked the Bootstrap CSS file to your HTML file correctly. Here is an example of how to use Bootstrap's column classes to create a two-column layout in HTML:

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<!DOCTYPE html>
<html>
  <head>
    <!-- Link the Bootstrap CSS file -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
  </head>
  <body>
    <div class="container">
      <div class="row">
        <div class="col-md-6">
          <!-- First column content goes here -->
        </div>
        <div class="col-md-6">
          <!-- Second column content goes here -->
        </div>
      </div>
    </div>
  </body>
</html>

In this example, the container class sets the maximum width for the content, and the row class groups the columns together. The col-md-6 class sets each column to occupy half (6/12) of the available space. Make sure to adjust this value according to your needs.

To target multiple classes in CSS, you can chain the class selectors together without leaving a space between them. This will select only the elements that have all the classes specified. For example:

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.class1.class2 {
  /* CSS rules here */
}

This will target all elements that have both class1 and class2 classes.

Here's an example with HTML:

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<div class="class1 class2">This element has both class1 and class2</div>
<div class="class2">This element only has class2</div>
<div class="class1">This element only has class1</div>

In this case, only the first div element with both class1 and class2 will be affected by the CSS rules in .class1.class2 class selector.

In Bootstrap, you can use the class text-* to create a responsive font size that changes according to the device width.

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<p class="text-small text-md-normal text-lg-xlarge">Link here</p>

This example creates a small font size for mobile viewports and extra-large size for tablet/desktop viewports. The breakpoints and the associated classes are:

For more information, you can refer to the Bootstrap documentation.

You can hide an image on mobile devices using Bootstrap's built-in d-none d-md-block classes. To hide an image on small screens, use d-none d-sm-block instead. Here's an example:

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<img src="myimage.jpg" class="d-none d-sm-block">

This code will cause the image to be hidden on devices with a max-width of 576px. To learn more about the responsive utilities in Bootstrap, check out the official documentation here:

https://getbootstrap.com/docs/4.5/utilities/display/#responsive-display

Using Bootstrap, you can make an individual columns not take up any space when the display:none CSS property is set by using the order-* and d-* classes. For example:

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<div class="row">
    <div class="col-6 order-1 order-md-2 d-none d-md-block">Item 1</div>
    <div class="col-6 order-2 order-md-1">Item 2</div>
</div>

By setting the order-1 and d-none classes on the Item 1 column, it will not take up the space on mobile devices and tablets, but will on larger displays. On larger displays, it will appear in between Item 1 and Item 2 (via order-md-2). For more information, please see Bootstrap's documentation on responsive ordering.

We can use Bootstrap's built-in border classes to create various border styles.

To add a border to any element, add the class .border to the element.

If you'd like to add a specific border style, such as a dashed border, you can use the .border-* classes.

For example, you can use the .border-dashed class to create a dashed border like this:

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<div class="border border-dashed">
  Example border
</div>

If you inspect the element, you will see something like this:

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.border-dashed {
   border-style: dashed;
}

For more information on border classes, see the Bootstrap documentation.

You can add color to a list of classes individually using CSS. For example, you could use the following CSS code:

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.firstClass {
    color: #00FF00;
}
.secondClass {
    color: #0000FF;
}

The code above sets the colors of the classes firstClass and secondClass to green and blue respectively. You can replace the color codes with any colors that you'd like. To learn more about CSS colors, please refer to this link: https://www.w3schools.com/cssref/css_colors.asp.

Hooks are a feature introduced in React 16.8 that allows developers to add state to functional components. Hooks allow developers to use logical components, run data fetching and execute side effects. Learn more in the official React documentation: https://reactjs.org/docs/hooks-intro.jsx

Example:

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import React, {useState} from 'react';

function App() { 
  const [state, setState] = useState('Hello');

  return (
    <div>
      <p>{state}</p>
    </div>
  );
}

export default App;

You can use div elements to structure the layout of a web page. A div is a block-level container element which can be used along with classes, IDs and other attributes to style and layout websites.

Here is a simple example in HTML:

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<div> 
    Content here 
</div> 

And in CSS:

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div { 
    margin: 10px; 
    padding: 10px; 
} 

Using CSS classes, you can make a link black and not underlined by adding the following code in your CSS file:

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.black-link {
  color: black;
  text-decoration: none;
}

You can then apply this class to any link that you don't want to be underlined, like so:

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<a href="//www.example.com" class="black-link">Example Link</a>

In object oriented programming, classes and interfaces are two separate and distinct concepts. A class provides structure to create objects that have methods and attributes, while an interface is an abstract class that enables a class to adhere to a certain protocol.

Classes are used to store data and implement the logic related to the data. Classes can contain variables and methods, or functions that specify how a given data type behaves.

An interface is like a template which defines a group of related methods with empty bodies. The implementation of the methods is provided by the class that implements the interface. Interfaces are used to enforce a certain behavior in the class that implements it, as all methods defined by an interface must be implemented in the class.

Also, while a class can extend only one class, it can implement multiple interfaces. This is useful when unrelated classes need to share the same behavior.

You can use the CSS class selector to style an element with multiple classes. The class selector is denoted by a period . followed by the class name.

For example, given the following HTML:

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<div class="block red color-1">
</div>

You can use CSS to style the element like this:

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.block {
  background-color: yellow;
}
.red {
  color: red;
}
.color-1 {
  color: blue;
}

This would render the HTML element with a yellow background, red text and blue text (overriding the style set by the red class).

Using Bootstrap you can create up to 12 columns across the page. To create 5 columns you will need to use the col-5 class. Below is an example:

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<div class="row">
    <div class="col-5">Column 1</div>
    <div class="col-5">Column 2</div>
    <div class="col-5">Column 3</div>
    <div class="col-5">Column 4</div>
    <div class="col-5">Column 5</div>
</div>

Python is a programming language that uses objects, classes, and variables to create, store, and manipulate data. It is a high-level language, meaning it is highly abstracted from the computer's physical hardware, making it easier to read and write. Python is an interpreted language - it is not compiled, rather it is translated into a form the computer understands at runtime. Python uses statements and code blocks to structure tasks and handle different cases; This enables users to develop complex programs in a fraction of the time it takes to write the same code in a language such as C++. You can find more information about Python here.