Bottle
Bottle is a fast, micro web framework for Python. It has no dependencies besides the Python standard library and is so lightweight that the module for it is a single file. It handles everything you need to create small websites or applications. It’s also async-friendly, allowing you to easily keep your application data continuously updated. Another nice feature is it comes with a built-in HTTP development server.
It’s a great choice if you’re building something small or if you want to quickly prototype an idea. Because it is simple to use, it’s also great for newer developers. You can easily understand how to use Bottle for whatever project you’re creating and get your application production-ready fast.
One drawback of Bottle is it has less documentation and support than Flask or Django. If you want to build a big, complex web application, you may find your efforts better supported using one of the other tools. There’s also a number of things that Bottle doesn’t have built-in, such as an admin panel, ORM framework, NoSQL support, REST support, security, web forms, or authentication. However, there are a number of plugins and libraries you can use to add these things to Bottle if you want to do so.
The sticking point will probably come back to everything not having a lot of documentation to work with.
Flask
Many developers choose Flask over Bottle because they feel it offers everything Bottle does and more. I would argue that what it has over Bottle is popularity, leading to more documentation, extensions, and plugins being built for use with Flask. If you’re a newer developer trying to do something more complex, Flask might be a better choice than Bottle because chances are someone’s already documented a way to do whatever you’re working on. It’s a toss-up. With Bottle, you can probably read all the code for the module. With Flask, you get tons of content to support your project.
Flask is great with extensions. Using these, you can add an admin panel, support REST, and web form support. It offers built-in security, but it’s minimal. You can increase Flask’s security with tools like Flask-Security, but you’ll have to stay on top of updates to make sure vulnerabilities are patched as they are discovered.
Django
By now, you’re probably thinking, “Hey, I thought you were comparing Bottle to Flask to Django… but you didn’t mention Django in the first two.” There’s a reason for that: Django is pretty different than either Bottle or Flask. If you’re starting out and you just want to build sample code or a small application, I’d immediately recommend you pick between Bottle and Flask for your project. Django is incredibly powerful, handles all kinds of things for you, making your life easy, but it has a steep learning curve.
Django is a web framework that makes it fast and easy to develop web applications… as long as you have time to learn the framework first. One of the best features is that it is secure. If you don’t know much about application security, Django was engineered to help protect your website for you. It gives you a secure way to manage accounts and passwords and prevents you from making mistakes like putting session information in cookies. It enables protection against vulnerabilities like SQL injection, cross-site scripting, cross-site request forgery, and clickjacking.
Bottle and Flask allow you to build sites that include these things, but they’re not handled for you. If you’re an experienced developer who knows how to avoid these security mistakes, then Bottle or Flask might still be great choices. Otherwise, learning Django can save you a lot of security headaches.
When it comes to documentation, Flask probably still beats out Django. However, if you’re willing to put in the time to learn Django, it’s worth it. It has a lot of things you want to do available out of the box. Most things you’d want to do (e.g. handling sessions, authentication, user management, content management, etc.) are available in Django. And while there’s less documentation, there’s still a lot to choose from.
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