Execution python3 I get a **"Segmentation fault"** error. 

How can I reinstall python3 by hand without apt, apt-get etc because apt needs python3!
dpkg --configure -a 
returned ok

Can I find all python package in a tar?
 
    python = python3.7.3
    
    Linux pi-hole 5.4.72+ #1356 Thu Oct 22 13:56:00 BST 2020 armv6l GNU/Linux
    (rpi0w buster)