What is the correct way to create Swagger documentation for Flask?

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To create Swagger documentation for Flask, you can follow these steps:

1. Install the necessary libraries: pip install flasgger flask-restful

2. Import the necessary libraries in your Flask app:

   from flask import Flask
   from flasgger import Swagger
   from flask_restful import Api
   

3. Create an instance of the Flask app:

   app = Flask(__name__)
   api = Api(app)
   

4. Create an instance of the Swagger object:

   swagger = Swagger(app)
   

5. Define your API routes using Flask's @app.route() decorator and Flask-RESTful's api.resource() decorator:

   @app.route('/')
   def home():
      return 'Hello, World!'
   
   class Greeting(Resource):
      def get(self):
          return {'message': 'hello, world!'}
   
   api.add_resource(Greeting, '/greeting')
   

6. Add Swagger documentation for each route using the @swagger.doc() decorator:

   @app.route('/')
   @swagger.doc({
      'summary': 'Home page',
      'description': 'Returns a welcome message',
      'responses': {
          '200': {
              'description': 'A welcome message is returned',
              'content': {
                  'text/plain': {
                      'example': 'Hello, World!'
                  }
              }
          }
      }
   })
   def home():
      return 'Hello, World!'
   
   class Greeting(Resource):
      @swagger.doc({
          'summary': 'Greeting message',
          'description': 'Returns a welcome message',
          'responses': {
              '200': {
                  'description': 'A welcome message is returned',
                  'content': {
                      'application/json': {
                          'example': {'message': 'hello, world!'}
                      }
                  }
              }
          }
      })
      def get(self):
          return {'message': 'hello, world!'}
   
   api.add_resource(Greeting, '/greeting')
   

7. Run your Flask app and navigate to http://localhost:5000/apidocs to see your Swagger documentation.