Let me ask you a macroscopic question about the choice of building a mobile app backend server

It's my first time to ask you a question about hash codes.

I'm a beginner who started out as Python.

Python web-crawling is fun, so I did it with code from books and blogs.

I've even done a square with the opencv code on GitHub. I'm a total beginner.

I took a web-making class in life coding.

I only studied Python for server language, so you can just think of it as knowing grammar.

Oh, and I made it into a personal photo blog. Just the skeleton.

I have a goal that I want to make, so I'm going to challenge the mobile app.

I want to make it a real service I want to make at least a prototype that can be implemented.

I'm going to make an iPhone app first, but I'm asking you a question because I have some concerns about the server part.

I'll ask you a question now.

In my situation where I know Python & Django slightly, will I lose time and completeness if I push to Python & Django without changing to Ruby Onrails?
(From what I heard, Python Janggo needs to be able to handle Python well as long-term functions to make it complete, and Ruby On Rail is easier to complete if you know its function well. From a beginner's point of view, what is the difference between getting Python Janggo and Ruby Onrail's investment? Is it easier to quit Python Janggo and start Ruby Onrails? )

Thank you.