ModuleNotFoundError: No module named 'psycopg2'

 I got this error when I'm trying to run odoo server 

ModuleNotFoundError: No module named 'psycopg2'

so to fix it , I run the commands bellow

sudo apt-get update
sudo apt-get install libpq-dev
sudo pip3 install psycopg2-binary

 & for runing odoo 15.0 with python 3.8 we can use 

sudo python3.8 -m pip install --upgrade psycopg2-binary