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Flask vs Sanic: What are the differences?

Introduction

Flask and Sanic are two popular web frameworks for Python. Both frameworks have their own advantages and differences that make them suitable for different use cases. In this article, we will explore the key differences between Flask and Sanic.

  1. Performance: One of the major differences between Flask and Sanic is their performance. Sanic is built on asynchronous and non-blocking design principles, which allows it to handle a high number of concurrent requests efficiently. On the other hand, Flask is a traditional synchronous framework, which can handle a limited number of concurrent requests compared to Sanic.

  2. Ease of Use: Flask is known for its simplicity and ease of use. It has a minimalistic design and provides a straightforward approach to web development. Sanic, on the other hand, has a steeper learning curve due to its asynchronous nature and more complex API. Developing with Sanic requires a good understanding of asynchronous programming concepts.

  3. Scalability: Due to its asynchronous nature, Sanic is highly scalable and can easily handle large-scale applications with a high volume of traffic. Flask, on the other hand, may face scalability issues when handling a large number of concurrent requests, as it follows a synchronous execution model.

  4. Dependency Management: Flask uses a traditional style of dependency management where you install and import libraries directly into your project. Sanic, on the other hand, uses an async ecosystem, which means it requires special async-compatible versions of libraries. This can make dependency management a bit more complex in Sanic compared to Flask.

  5. Middleware Support: Both Flask and Sanic provide middleware support, allowing you to add functionality to your application's request/response handling process. However, Sanic provides more advanced middleware capabilities due to its support for coroutine-based middleware functions, which can be used to perform complex tasks efficiently.

  6. Community and Ecosystem: Flask has a large and mature community with a vast ecosystem of extensions and libraries available. It has been around for a longer period and has gained a significant user base. Sanic, on the other hand, has a smaller community and ecosystem compared to Flask. While it is rapidly growing, it may lack the extensive range of third-party libraries and resources that Flask has.

In summary, Flask is a simpler and more beginner-friendly framework with a larger community and ecosystem, while Sanic offers better performance, scalability, and advanced features, making it suitable for high-performance applications with a good understanding of asynchronous programming.

Advice on Flask and Sanic
kristan-dev
Senior Solutions Analyst · | 8 upvotes · 343.8K views

My journey to developing REST APIs started with Flask Restful, and I've found it to be enough for the needs of my project back then. Now that I've started investing more time on personal projects, I've yet to decide if I should move to use Django for writing REST APIs. I often see job posts looking for Python+Django developers, but it's usually for full-stack developers. I'm primarily interested in Data Engineering, so most of my web projects are back end.

Should I continue with what I know (Flask) or move on to Django?

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Replies (1)
Rafael Torres
Technical Lead at 4Agile · | 9 upvotes · 334.3K views

If you want to be a Web developer with knowledge in another frontend and NoSql technology, maybe continue with Flask. However, if you want to create very fast solutions to grow up with a new business and merge these with data analysis and other tools, Django is the answer. Basically read more about the service architecture where you feel more comfortable, Microservice or Monolithic, but please will not married with any because they solve issues to different contexts.

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Girish Sharma
Software Engineer at FireVisor Systems · | 6 upvotes · 272.4K views
Needs advice
on
BottleBottleFlaskFlask
and
NamekoNameko

Which is the best Python framework for microservices?

We are using Nameko for building microservices in Python. The things we really like are dependency injection and the ease with which one can expose endpoints via RPC over RabbitMQ. We are planning to try a tool that helps us write polyglot microservices and nameko is not super compatible with it. Also, we are a bit worried about the not so good community support from nameko and looking for a python alternate to write microservices.

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Replies (1)
Recommends
on
BottleBottle

Bottle is much less bloated and fast. Its built-in templating system is one of the fastest as it compiles the templates in bytecode. Also Bottle has no depenencies, preventing dependency bloat.

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Saurav Pandit
Application Devloper at Bny Mellon · | 6 upvotes · 289.1K views

I have just started learning Python 3 weeks ago. I want to create a REST API using python. The API will be used to save form data in an Oracle database. The front end is using AngularJS 8 with Angular Material. In python, there are so many frameworks to develop REST APIs.

I am looking for some suggestions which REST framework to choose?

Here are some features I am looking for:

  • Easy integration and unit testing, like in Angular. We just want to run a command.

  • Code packaging, like in java maven project we can build and package. I am looking for something which I can push in as an artifact and deploy whole code as a package.

  • Support for swagger/ OpenAPI

  • Support for JSON Web Token

  • Support for test case coverage report

Framework can have features included or can be available by extension. Also, you can suggest a framework other than the ones I have mentioned.

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Replies (1)
Recommends
on
FlaskFlask
at

For starters flask provides a beautiful and easy way to create REST APIs. Also its supported by excellent beginner docs as well as a very active community. Another good thing with Flask is its widely available list of plugins which allow you to build as you go. Its also good in performance and can scale to a quite decent level. However, if you are sure your project is going to be fairly big, it would be better to start with Django as it provides a lot of features out of the box and is extremely stable in performance. Both these frameworks have support for Swagger, JWT, Coverage Report although you have to install plugins for them. Deploying both of these are fairly simple and there is huge documentation available. Django has one of the best documentations I have come across. I hope I was able to answer your queries.

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Pros of Flask
Pros of Sanic
  • 14
    Flexibilty
  • 10
    For it flexibility
  • 9
    Flexibilty and easy to use
  • 8
    Flask
  • 7
    User friendly
  • 6
    Secured
  • 5
    Unopinionated
  • 3
    Orm
  • 2
    Secure
  • 1
    Beautiful code
  • 1
    Easy to get started
  • 1
    Easy to develop and maintain applications
  • 1
    Not JS
  • 1
    Easy to use
  • 1
    Documentation
  • 1
    Python
  • 1
    Minimal
  • 1
    Lightweight
  • 1
    Easy to setup and get it going
  • 1
    Perfect for small to large projects with superb docs.
  • 1
    Easy to integrate
  • 1
    Speed
  • 1
    Get started quickly
  • 1
    Customizable
  • 1
    Simple to use
  • 1
    Powerful
  • 1
    Rapid development
  • 0
    Open source
  • 0
    Well designed
  • 0
    Productive
  • 0
    Awesome
  • 0
    Expressive
  • 0
    Love it
  • 5
    Asyncio
  • 2
    Fast
  • 2
    Easy to use server
  • 1
    Websockets

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Cons of Flask
Cons of Sanic
  • 10
    Not JS
  • 7
    Context
  • 5
    Not fast
  • 1
    Don't has many module as in spring
    Be the first to leave a con

    Sign up to add or upvote consMake informed product decisions

    What is Flask?

    Flask is intended for getting started very quickly and was developed with best intentions in mind.

    What is Sanic?

    Sanic is a Flask-like Python 3.5+ web server that's written to go fast. It's based on the work done by the amazing folks at magicstack. On top of being Flask-like, Sanic supports async request handlers.

    Need advice about which tool to choose?Ask the StackShare community!

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    What are some alternatives to Flask and Sanic?
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    Lots of people use React as the V in MVC. Since React makes no assumptions about the rest of your technology stack, it's easy to try it out on a small feature in an existing project.
    See all alternatives