server.py: 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 CentOS possible default full paths are:

/usr/share/doc/python-myghty-1.1/examples/zblog/bin/server.py - from package: python-myghty

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/share/doc/python-myghty/examples/zblog/bin/server.py - from package: python-myghty

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

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