pyplusplus_gui.pyw: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/pyplusplus_gui.pyw - from package: python-py++

You may install the required package with command apt-get install {package}

Error in other languages:
pyplusplus_gui.pyw: bevel nie gevind nie
pyplusplus_gui.pyw: comandă negăsită
pyplusplus_gui.pyw: comando não encontrado
pyplusplus_gui.pyw: commande introuvable
pyplusplus_gui.pyw: command not found
pyplusplus_gui.pyw: käsku ei ole
pyplusplus_gui.pyw: không tìm thấy lệnh
pyplusplus_gui.pyw: komanda nerasta
pyplusplus_gui.pyw: Kommando nicht gefunden.
pyplusplus_gui.pyw: kommandot finns inte
pyplusplus_gui.pyw: komut yok
pyplusplus_gui.pyw: nie znaleziono polecenia
pyplusplus_gui.pyw: níor aimsíodh an t-ordú
pyplusplus_gui.pyw: no se encontró la orden
pyplusplus_gui.pyw: no s'ha trobat l'ordre
pyplusplus_gui.pyw: opdracht niet gevonden
pyplusplus_gui.pyw: parancs nem található
pyplusplus_gui.pyw: perintah tidak ditemukan
pyplusplus_gui.pyw: príkaz nenájdený
pyplusplus_gui.pyw: příkaz nenalezen
pyplusplus_gui.pyw: команда не найдена
pyplusplus_gui.pyw: командата не е открита
pyplusplus_gui.pyw: 命令找不到
pyplusplus_gui.pyw: コマンドが見つかりません