In case "Open system shell" happens someday, here's my take on this: https://bitbucket.org/plas/thonny/src/master/thonny/plugins/system_shell/

It's a plugin for my beginners' IDE Thonny (http://thonny.cs.ut.ee). It creates a menu item which opens system terminal with current interpreter's binary folder(s) prepended to the path. As there may be several Python commands on path (eg. python and python3 in /usr/bin) and short pip command may be on path only for another version, a script gets automatically executed in this new terminal, which detects and tells user the commands to use (see attached screenshot)