To run python functions simultaneously (parallel)

I made selenium crawl using Python and am using it.

As a result, the implementation structure is def function_name(url): Function Contents

It looks like above.

url = 'www.siteurl.com'

function_name(url)

I'm doing it like this How can I run multiple pages at the same time?

I entered different addresses in functionion_name(url) and executed them, so it became sequential I want to crawl in parallel, not in sequence