pi@raspberrypi.local:~ $ cat /lib/systemd/system/clockapp.service
[Unit]
Description=Clock Application
After=network.target

[Service]
ExecStart=/usr/bin/python /opt/clock/Clock.py
Type=simple
User=pi
Group=pi
Restart=on-failure
RestartSec=5
StartLimitInterval=60s
StartLimitBurst=3

[Install]
WantedBy=multi-user.target


# ask systemd to reload so it picks up the changes we made
pi@raspberrypi.local:~ $ sudo systemctl daemon-reload

# enable my service so it starts on boot
pi@raspberrypi.local:~ $ sudo systemctl enable clockapp.service

# and start it now
pi@raspberrypi.local:~ $ sudo systemctl start clockapp.service