I've found many positions advertised as say, "Python engineer" end up being more that you are expected to be willing to work with Python, not that you are already a Python expert. Of course this isn't always the case, but in my last 4 or so years of semi-actively interviewing for a new job, I've found this to be the majority.

Also, even if they do require you to be a Python-specific expert, I don't find this requirement any more abhorrent than a company that expects you to be an leetcode expert, especially for a position that is minimally algorithmic.