Use f-strings for string formatting 
Hi, I would be glad to help with this. Is there anyone else working on it? Hi, I would be glad to work on this too. #self-assign Hi @Carlosbogo,

would you be interested in replacing the `.format` and `%` syntax with f-strings in the modules in the `datasets` directory since @Mehdi2402 has opened a PR that does that for all the other directories? Oh I see. I will be glad to help with the `datasets` directory then.
f-strings offer better readability/performance than `str.format` and `%`, so we should use them in all places in our codebase unless there is good reason to keep the older syntax.

> **NOTE FOR CONTRIBUTORS**: To avoid large PRs and possible merge conflicts, do 1-3 modules per PR. Also, feel free to ignore the files located under `datasets/*`.