py3compile: 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/py3compile - from package: python3-minimal

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

Error in other languages:
py3compile: bevel nie gevind nie
py3compile: comandă negăsită
py3compile: comando não encontrado
py3compile: commande introuvable
py3compile: command not found
py3compile: käsku ei ole
py3compile: không tìm thấy lệnh
py3compile: komanda nerasta
py3compile: Kommando nicht gefunden.
py3compile: kommandot finns inte
py3compile: komut yok
py3compile: nie znaleziono polecenia
py3compile: níor aimsíodh an t-ordú
py3compile: no se encontró la orden
py3compile: no s'ha trobat l'ordre
py3compile: opdracht niet gevonden
py3compile: parancs nem található
py3compile: perintah tidak ditemukan
py3compile: príkaz nenájdený
py3compile: příkaz nenalezen
py3compile: команда не найдена
py3compile: командата не е открита
py3compile: 命令找不到
py3compile: コマンドが見つかりません