ModuleNotFoundError: No module named 'gi'

[rseiver96]

Hi there, I'm a mac user with no coding knowhow trying to use this to download Morrowind on my Mac (without having to use Bootcamp) to play with OpenMW. In trying to run the steam-appmanifest In Terminal, I encountered the error named in the title. The whole error says this:
"t.py ; exit;
Traceback (most recent call last):
File "/Users/MYCOMPUTER/Desktop/steam-appmanifest.py", line 16, in
from gi.repository import Gtk
ModuleNotFoundError: No module named 'gi'
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[dsnvs]

Hey, @rseiver96, this is a dependency problem.
As explained in the readme file, on mac osx you should install pygobject3 to use the script, this error tells me you didn't have the pygobject3 installed.

[timhwang21]

For anyone googling, the README is incorrect. Leave out the --with-python3 flag, which appears to be deprecated.