I'm currently trying to have a program startup when the Raspberry Pi 3 I'm using boots. The program controls a drone and will need a network connection before starting. When I try to use Systemd to start this program, I get this error message;

droneStartup.service - The Drone Startup service.
   Loaded: loaded (/etc/systemd/system/droneStartup.service; disabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2019-04-15 14:06:24 EDT; 1s ago
  Process: 1895 ExecStart=/bin/bash /home/pi/Systemd_test.py (code=exited, status=2)
 Main PID: 1895 (code=exited, status=2)

Apr 15 14:06:24 pi systemd[1]: Started The Drone Startup service..
Apr 15 14:06:24 pi bash[1895]: from: can't read /var/mail/time
Apr 15 14:06:24 pi bash[1895]: /home/pi/Systemd_test.py: line 4: syntax error near unexpected token `'Looping...''
Apr 15 14:06:24 pi bash[1895]: /home/pi/Systemd_test.py: line 4: `    print('Looping...')'
Apr 15 14:06:24 pi systemd[1]: droneStartup.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
Apr 15 14:06:24 pi systemd[1]: droneStartup.service: Unit entered failed state.
Apr 15 14:06:24 pi systemd[1]: droneStartup.service: Failed with result 'exit-code'.

This is the placeholder program I'm using to test the startup;

from time import sleep

while True :
    print('Looping...')
    sleep(1)

And this is the .service file I'm using;

[Unit]
Description=The Drone Startup service.
Wants=network-online.target
After=network-online.target

[Service]
ExecStart=/bin/bash /home/pi/Systemd_test.py

[Install]
WantedBy=multi-user.target

I don't know why it's coming up with a syntax error, and would greatly appreciate any help with this issue.