on-modify script hangs, seemingly never finishes

[natemcintosh]

I suspect I've got something configured incorrectly.

I have installed both timewarrior and taskwarrior using apt.

I copied the script on-modify.py into ~/.task/hooks/on-modify.timewarrior, then ran chmod +x ~/.task/hooks/on-modify.timewarrior.

Running task diagnostics gives

Hooks
     System: Enabled
   Location: /home/ute2/.task/hooks
     Active: on-modify.timewarrior (executable)
   Inactive:

However, when I start a task, e.g. task 3 start it just hangs. Looking at htop tells me that the python script is running, but it never seems to finish