I think references play a stromg role here. Every reference may be positive but there can be a noticeable difference between positively describing someome who knows everything and someone who does everything.

Also for jack-of-all trades looking to perform well in interviews, my advice is to engage context specific memory. If it's a Python role set up a past Python project on your computer and dig into it a little bit in the minutes before getting on the phone. Your Python mind will come back a little bit.