Today's lesson , never

sudo rm -rf /usr/lib/python3.5/dist-packages on a fedora Machine. It breaks everything.

So any ideas how to fix it. A

Jep.
Next time use docker for your experiments ^^

sudo yum remove python3
sudo yum install python3
Might help...
No guarantees made

Are you just getting a black screen? Or are you getting to your desktop?

For black screen that won't log you in try switching ttys and inputting your log in stuff there.

From there you can do the dnf stated above.
If still no dice what's the error messages?

Download yum and its dependencies manualy (as rpms from mirror) and reinstall them via rpm and then reinstall probably everything using dnf or yum.