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In this tutorial, we have provided the basic code to create the LangChain chatbot app. You’ll find a comprehensive example, instructions, and guidance to help you. Also Read: Introduction to LangChain – Use With Python LangChain ChatBot App Here’s a detailed example of a chatbot that generates poems based on user-provided prompts. Firstly, let’s try […]

The post Create a Full-fledged LangChain App – A ChatBot appeared first on TechBeamers.

https://www.foxnews.com/tech/another-home-thermostat-found-vulnerable-to-attack

A network cable connection to any thermostat is still a safer and overall less expensive long term choice.

DjangoCon Europe 2024 will be held June 5th-9th in Vigo, Spain but we're already looking ahead to the 2025 conference. Could your town - or your football stadium, circus tent, private island or city hall - host this wonderful community event?

Hosting a DjangoCon is an ambitious undertaking. It's hard work, but each year it has been successfully run by a team of community volunteers, not all of whom have had previous experience - more important is enthusiasm, organizational skills, the ability to plan and manage budgets, time and people - and plenty of time to invest in the project.

We've set up a working group of previous DjangoCon Europe organizers that you can reach out to with questions about organizing and running a DjangoCon Europe. european-organizers-support@djangoproject.com. There will also be an informational session set up towards the end of January or early February for interested organizers. Please email the working group to express interest in participating.

In order to give people the chance to go to many different conferences DjangoCon Europe should be held between January 5 and April 15 2025. Please read the licensing agreement the selected organizers will need to sign for the specific requirements around hosting a DjangoCon Europe

If you're interested, we'd love to hear from you. This year we are going to do rolling reviews of applications, in order to hopefully give more time and certainty to the selected proposal to start planning. The board will begin evaluating proposals on February 20th. The selection will be made at any time between February 20th and May 31st. The DSF Board will communicate when a selection has been made and the application process is complete. IF you are interested in organizing it is in your best interest to get a good proposal in early.

Following the established tradition, the selected hosts will be publicly announced at this year's DjangoCon Europe by the current organizers.

The more detailed and complete your proposal, the better. Things you should consider, and that we'd like to know about, are:

• dates Ideally between early January and mid April 2025
• numbers of attendees
• venue(s)
• accommodation
• transport links
• budgets and ticket prices
• committee members

We'd like to see:

• timelines
• pictures
• prices
• draft agreements with providers
• alternatives you have considered

Email you proposals to djangocon-europe-2025-proposals at djangoproject dot com. We look forward to reviewing great proposals that continue the excellence the whole community associates with DjangoCon Europe.

In this tutorial, you’ll explore inheritance and composition in Python. Inheritance and composition are two important concepts in object-oriented programming that model the relationship between two classes. They’re the building blocks of object-oriented design, and they help programmers to write reusable code.

By the end of this tutorial, you’ll know how to:

• Use inheritance in Python
• Model class hierarchies using inheritance
• Use multiple inheritance in Python and understand its drawbacks
• Use composition to create complex objects
• Reuse existing code by applying composition
• Change application behavior at runtime through composition

Get Your Code: Click here to get the free sample code that shows you how to use inheritance and composition in Python.

Inheritance and composition are two major concepts in object-oriented programming that model the relationship between two classes. They drive the design of an application and determine how the application should evolve as new features are added or requirements change.

Both of them enable code reuse, but they do it in different ways.

Inheritance models what’s called an is a relationship. This means that when you have a Derived class that inherits from a Base class, you’ve created a relationship where Derived is a specialized version of Base.

Inheritance is represented using the Unified Modeling Language, or UML, in the following way:

This model represents classes as boxes with the class name on top. It represents the inheritance relationship with an arrow from the derived class pointing to the base class. The word extends is usually added to the arrow.

Note: In an inheritance relationship:

• Classes that inherit from another are called derived classes, subclasses, or subtypes.
• Classes from which other classes are derived are called base classes or super classes.
• A derived class is said to derive, inherit, or extend a base class.

Say you have the base class Animal, and you derive from it to create a Horse class. The inheritance relationship states that Horse is an Animal. This means that Horse inherits the interface and implementation of Animal, and you can use Horse objects to replace Animal objects in the application.

This is known as the Liskov substitution principle. The principle states that if S is a subtype of T, then replacing objects of type T with objects of type S doesn’t change the program’s behavior.

You’ll see in this tutorial why you should always follow the Liskov substitution principle when creating your class hierarchies, and you’ll learn about the problems that you’ll run into if you don’t.

Composition is a concept that models a has a relationship. It enables creating complex types by combining objects of other types. This means that a class Composite can contain an object of another class Component. This relationship means that a Composite has a Component.

UML represents composition as follows:

The model represents composition through a line that starts with a diamond at the composite class and points to the component class. The composite side can express the cardinality of the relationship. The cardinality indicates the number or the valid range of Component instances that the Composite class will contain.

In the diagram above, the 1 represents that the Composite class contains one object of type Component. You can express cardinality in the following ways:

• A number indicates the number of Component instances that Composite contains.
• The * symbol indicates that the Composite class can contain a variable number of Component instances.
• A range 1..4 indicates that the Composite class can contain a range of Component instances. You indicate the range with the minimum and maximum number of instances, or minimum and many instances like in 1..*.

Note: Classes that contain objects of other classes are usually referred to as composites, while classes that are used to create more complex types are referred to as components.

For example, your Horse class can be composed by another object of type Tail. Composition allows you to express that relationship by saying Horse has a Tail.

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