matchers.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 Debian possible default full paths are:

/usr/lib/python3/dist-packages/lepl/bin/matchers.py - from package: python3-lepl
/usr/lib/python3/dist-packages/lepl/bin/_test/matchers.py - from package: python3-lepl
/usr/lib/python2.7/dist-packages/lepl/bin/matchers.py - from package: python-lepl
/usr/lib/python2.7/dist-packages/lepl/bin/_test/matchers.py - from package: python-lepl
/usr/share/pyshared/lepl/bin/matchers.py - from package: python-lepl
/usr/share/pyshared/lepl/bin/_test/matchers.py - from package: python-lepl

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

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