python
import sys
sys.path.insert(0, '/usr/share/gcc-6/python/')
from libstdcxx.v6.printers import register_libstdcxx_printers
register_libstdcxx_printers (None)
end

python
import sys
sys.path.insert(0, '/usr/share/gcc/python/')
from libstdcxx.v6.printers import register_libstdcxx_printers
register_libstdcxx_printers (None)
end

$ ll /usr/share/gcc/python/
total 4.0K
drwxr-xr-x 3 root root 4.0K May 22 14:07 libstdcxx
$ ll /usr/share/gcc/python/libstdcxx/v6/
total 120K
-rw-r--r-- 1 root root 1.2K May 13  2022 __init__.py
-rw-r--r-- 1 root root  86K May 13  2022 printers.py
-rw-r--r-- 1 root root  28K May 13  2022 xmethods.py

https://undo.io/resources/gdb-watchpoint/here-quick-way-pretty-print-structures-gdb/
https://undo.io/resources/gdb-watchpoint/debugging-pretty-printers-gdb-part2/
https://undo.io/resources/gdb-watchpoint/debugging-pretty-printers-gdb-part3/