Loading page in flask web app while scraping another website using selenium
I found the answer myself to my question.I am not a web programmer so I lack some automatism sometimes, but by inspecting my waiting page, I saw an error in the JS script in the concat function.Calling '{{fun}}' in the script instead of {{fun}} did the thing.
I didn't understand this behavior since my object fun is a python string, but I read the jinja2 doc and all became lucid to me, we can see in this link https://jinja.palletsprojects.com/en/2.10.x/templates/ the following:
{{ ... }} for Expressions to print to the template outputThis prints the value, so it is no longer a string but raw text in html template.(type(print(x)) is None in python3 btw)
If this helps someone then I'm glad.