#!/bin/bash

ps auxw | grep my_script | grep -v grep > /dev/null
if [ $? != 0 ]
then
    echo "Process is not running."
    source /path/to/venv/bin/activate #start python environment
    export PYTHONUNBUFFERED=yes #to allow for running log output
    python /path/to/my/script/my_script.py >> /path/to/my/script/logs/output.log &
fi