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This article mainly introduces how to use Flask to write Python Web API, which has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.

Python is a high-level, object-oriented programming language known for its syntactic simplicity. It has always been a top-level programming language for building RESTful APIs.

Flask is a highly customizable Python framework that gives developers complete control over how users access data. Flask is a "microframework" based on Werkzeug's WSGI toolkit and Jinja 2 template engine. It is a web framework designed to develop RESTful APIs.

Flask is one of Python's fastest-growing frameworks, and many well-known websites such as Netflix, Pinterest, and LinkedIn have included Flask in their development technology stacks. Here is a simple example of how Flask allows users to retrieve data from the server via HTTP GET requests.

Initialize a Flask application

First, create a directory structure for your Flask project. You can do this anywhere in your system.

$ mkdir tutorial$ cd tutorial$ touch main.py$ python3 -m venv env$ source env/bin/activate(env) $ pip3 install flask-restfulCollecting flask-restfulDownloading https://files.pythonhosted.org/packages/17/44/6e49... 8da4/Flask_RESTful-0.3.7-py2.py3-none-any.whlCollecting Flask>=0.8 (from flask-restful)[...] Import Flask module

Then, import the flask module and its flask_restful library into your main.py code:

from flask import Flaskfrom flask_restful import Resource, Api app = Flask(__name__)api = Api(app) class Quotes(Resource): def get(self): return { 'William Shakespeare': { 'quote': ['Love all,trust a few,do wrong to none', 'Some are born great, some achieve greatness, and some greatness thrust upon them. '] }, 'Linus': { 'quote': ['Talk is cheap. Show me the code. '] } } api.add_resource(Quotes, '/') if __name__ == '__main__': app.run (debug=True) Run app

Flask contains a built-in HTTP server for testing. Let's test this simple API you created:

(env) $ python main.py * Serving Flask app "main" (lazy loading) * Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Debug mode: on * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

Starting the development server launches the Flask application, which contains a method called get to respond to a simple HTTP GET request. You can test it with wget, curl, or any web browser.

$ curl http://localhost:5000{ "William Shakespeare": { "quote": [ "Love all,trust a few,do wrong to none", "Some are born great, some achieve greatness, and some greatness thrust upon them. " ] }, "Linus": { "quote": [ "Talk is cheap. Show me the code. " ] }}

To see more sophisticated versions of similar Web APIs using Python and Flask, navigate to the Library of Congress's Chronicling America website, which provides historical newspapers and digitized newspapers with this information.

Why Flask?

Flask has the following main advantages:

Python is popular and widely used, so anyone familiar with Python can use Flask to develop.

It's light and simple.

Built with security in mind.

Excellent documentation with lots of clear, effective sample code.

There are also some potential drawbacks:

It's light and simple. But if you're looking for frames with lots of bundled libraries and prefabricated components, then this may not be the best choice.

If you have to build your own framework around Flask, you may find that the cost of maintaining customizations may offset the benefits of using Flask.

If you are building Web applications or APIs, consider choosing Flask. It is powerful and robust, and its excellent project documentation makes getting started easy. Try it out and evaluate it to see if it fits your project.

Thank you for reading this article carefully. I hope that the article "How to use Flask to write Python Web API" shared by Xiaobian will be helpful to everyone. At the same time, I hope that everyone will support you a lot and pay attention to the industry information channel. More relevant knowledge is waiting for you to learn!

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