Can you resore your system to restore point? If you've installed deepin normally after an update there are automatically generated. You can restore your system from grub (blue screen on boot up).
Python in general is a pretty vital component of the system, so there's a chance you might have nuked your desktop. Check if you can get into TTY and check if deepin desktop components are present.
Is There hope that Deepin UPDATE will fix the issue?on Deepin
I accidently deleted python using purge python and have black screen on DEEPIN. Can't open any documents