If you’re applying for a development or design job, you’ll almost certainly be asked how familiar you are with a particular programming language. Unless you’re applying for a senior developer position, you don’t necessarily have to be an expert at the particular language in most cases to get hired.

What you do need to show is that you’re very comfortable with it, and that you’re happy to dive in to learn what you don’t know. It’s more important that you show that you’re familiar with coding on a conceptual level, and have good problem-solving abilities. But just because you’ve worked more with Rails than Python doesn’t mean you can’t get a junior developer job if you show that you can quickly figure out problems and how to solve them.