What is the role of HTML, CSS, and JavaScript in a Python web app?

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In a Python web application, HTML, CSS, and JavaScript play crucial roles on the front end, while Python typically handles the back end. Here’s how they work together:

1. HTML (HyperText Markup Language) – Structure

HTML defines the structure and content of web pages. It organizes elements like headings, paragraphs, forms, tables, buttons, and links.

  • Python web frameworks like Flask or Django often generate HTML dynamically using templates (e.g., Jinja2 in Flask or Django templates).

  • HTML is what the browser renders as the page layout.

2. CSS (Cascading Style Sheets) – Presentation

CSS controls the look and feel of the HTML content. It defines styles such as:

  • Fonts, colors, spacing, and layout

  • Responsive design using media queries

  • Animations and transitions

CSS is typically included via static files in a Python web app, or through links to external stylesheets like Bootstrap.

3. JavaScript – Interactivity

JavaScript adds dynamic behavior to the web page, such as:

  • Handling user input (e.g., form validation, real-time search)

  • Updating content without reloading the page (AJAX, fetch API)

  • Communicating with the Python backend via APIs (REST or WebSocket)

It can be included inline, in static .js files, or through libraries like React or Vue.

Summary:

  • Python handles server-side logic (routing, database access, APIs).

  • HTML builds the structure.

  • CSS styles the layout.

  • JavaScript adds interactivity.

Together, they create a seamless web application experience, combining Python’s power with the web's core front-end technologies.

Read More

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How do you create a REST API using Python?

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