It is useful when you want to create a recipe for a python3 package without any recipe available.
In your bitbake build environment, run this command:
bitbake -s | awk '/^python3/ && !/-native/ && !/-cross/ {
name = $1;
ver = $2;
sub(/^python3-/, "", name);
sub(/^.*:/, "", ver);
sub(/-r[0-9]+.*$/, "", ver);