Error installing amonagent - Debian Stretch

[DerDanilo]

API_KEY=...............
bash -c "$(curl -L https://monitor.superdomain.de/install/)"
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  4489  100  4489    0     0   185k      0 --:--:-- --:--:-- --:--:--  190k
  File "<stdin>", line 1
    import platform ; print platform.dist()[0].lower()
                                   ^
SyntaxError: invalid syntax