Python api calls running client side

I want to build a website that runs around 5-10k or more api calls, gathers data parses it and shows it.

Most similar websites that i saw are written in js and the code is running on the client side.

I only know python and thus wrote the code in python.

Will it be possible each time a user clicks a certain button that the code and api calls will run client-side and not server side?

If not should i learn a while and covert code to js or just run in server side?