I think you need to try an avoid using python-pip unless you can get it to use a USB drive, @Vitalii-Topoliuk . if you're running out of space just installing python-pip, imagine how quickly you'll run out of space trying to install your python packages and all their dependencies on top of it.
my bet would be on trying to use pure python scripts and upload a self-contained project that doesn't need installation or compilation. alternatively, I would try building it in a buildroot environment and transferring it to the omega with all the dependencies resolved.
I've tried installing python-pip as well and ran out of space because it pulls in way too many dependencies. I wouldn't even know how to compute the space it's going to need, but i suspect it'll be much bigger than the available space on the omega, even with /www removed.