Flask using python

Publicado el: 21 agosto 2024
en el canal de: CodeLines

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flask is a lightweight web framework for python that is designed to make it easy to build web applications quickly. it's known for its simplicity and flexibility, making it a great choice for both beginners and experienced developers. in this tutorial, we'll cover the basics of flask, including installation, creating a simple web application, routing, handling forms, and using templates.

prerequisites

before you start, make sure you have python installed on your system. you can download it from the [official python website](https://www.python.org/downloads/).

installation

you can install flask using pip. open your terminal or command prompt and run the following command:

creating a simple flask application

1. **create a project directory**:

create a directory for your flask application, for example, `flask_app`.

2. **create the main application file**:

inside your project directory, create a file named `app.py`. this will be your main application file.

3. **run the application**:

in your terminal, navigate to your project directory and run the following command:

you should see output indicating that the server is running, typically on `http://127.0.0.1:5000/`. open this url in your web browser, and you should see "hello, flask!" displayed.

routing

routing is how flask determines what content to show for each url. you can define routes using the `@app.route()` decorator.

#### example of multiple routes

handling url parameters

you can also handle url parameters using angle brackets.

handling forms

flask makes it easy to handle forms. here's an example of a simple form.

1. **update your `app.py`**:

2. **create a templates directory**:

flask looks for templates in a folder named `templates`. create this directory in your project folder.

3. **create an html file**:

create a file named `index.html` in the `templates` directory.

using templates

flask uses jinja2 as its template eng ...

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