Yes, since js syntax is a bit familiar with python.
If you want to do frontend with js, backend with python then learning both of them is okay.
Btw, if you really want js, learn nodejs so that you can do both backend and frontend with it.
If you want more backend power, you should learn python first..
Basically, yes, if you know JS and whatever framework the company you’re applying to uses, you can get a job, but if it’s your first job they might expect to give you a decent amount of hands-on training for the first 3-6 months or so.
For just the absolute basics, if you’re already familiar with programming in general, 7 days seems possible. If you are unfamiliar with programming concepts in general like loops and events and variables then learning JS in 7 days seems unlikely.