Skip to 2:29 to directly see the way to create the build system
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Here's the Python build system:
{
"cmd": ["gnome-terminal -e 'bash -c \"python3 -u $file;echo;echo Press ENTER to exit; read line\"'"],
"shell": true
}
NOTE: THIS WILL ALSO WORK IN OTHER LINUX OSes BASED ON DEBIAN (Ubuntu, Linux Mint etc), IF IT HAS A GNOME TERMINAL.
For other OSes "gnome-terminal" must be replaced with the terminal which your OS has.(xubuntu - "xfce4-terminal", kubuntu - "konsole" etc)
PS: Many linux distros also come with xterm. So replace "gnome-terminal" with "xterm"