1. First, take a look at how your crawler starts
2. Package an api to the page, and call subprocess.call (command, shell=True) in this api to execute the directory to start the crawler
3. Call this api

after the front button is clicked.
1. flask listens on a http interface, such as / api/spider/start?token=xxx
Verify the token (mainly security) in the
2. interface, and then start the crawler logic

you can configure another celery, to receive commands to start the crawler on the flask and be responsible for invoking the crawler.
celery is usually used for more complex operations.

Project structure uses the project structure of the flask application:

---App/
    ---form/
    ---models/
    ---static/
    ---templates/
    ---view/ 
    ---spider/

you can put the spider in the spider folder, design the data table structure in the models file, verify the input url, in form, call the crawler in view to crawl, and use the view function rendering template to display the data.