idle-python2.7: 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/idle-python2.7 - from package: idle-python2.7

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

Error in other languages:
idle-python2.7: bevel nie gevind nie
idle-python2.7: comandă negăsită
idle-python2.7: comando não encontrado
idle-python2.7: commande introuvable
idle-python2.7: command not found
idle-python2.7: käsku ei ole
idle-python2.7: không tìm thấy lệnh
idle-python2.7: komanda nerasta
idle-python2.7: Kommando nicht gefunden.
idle-python2.7: kommandot finns inte
idle-python2.7: komut yok
idle-python2.7: nie znaleziono polecenia
idle-python2.7: níor aimsíodh an t-ordú
idle-python2.7: no se encontró la orden
idle-python2.7: no s'ha trobat l'ordre
idle-python2.7: opdracht niet gevonden
idle-python2.7: parancs nem található
idle-python2.7: perintah tidak ditemukan
idle-python2.7: príkaz nenájdený
idle-python2.7: příkaz nenalezen
idle-python2.7: команда не найдена
idle-python2.7: командата не е открита
idle-python2.7: 命令找不到
idle-python2.7: コマンドが見つかりません