Python3 auto load .venv without hard coded path in shebang

python3_auto_load_venv_example.py

#!/usr/bin/env python3

# activate .venv without having to change shebang for different install location
import sys
import os

python_venv = os.path.join(os.path.dirname(os.path.abspath(__file__)), '.venv/bin/python3')

if sys.executable != python_venv:
    print(f"Launched with {sys.executable}. Relaunching {python_venv} to load .venv")
    os.execv(python_venv, [python_venv, *sys.argv])

# the rest of the script!

venv creation (in the same location as your requirements.txt)

python3 -m venv .venv
source .venv/bin/activate
python3 -m pip install -r requirements.txt

your .venv should be created in the same folder as your .py file. If that is not suitable for your project adjust the path on line 7.

If using debian you may also need to do apt install python3-venv before doing the .venv creation.