[Python] No module named gi

i have try all the possible command given below:

pip install pgi , pip install PyGObject , pip install python-gi
​

Still not able to install the module in python . Installed python 3.7 also try to make a virtual environment but not able to install the module .

#import cv2
import gi
import numpy as np

gi.require_version('Gst', '1.0')
from gi.repository import Gst

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