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')

# confirm python3 exists in .venv before trying to load it!
if os.path.isfile(python_venv):
    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])
else:
    print(f"\n{python_venv} not found. Have you setup a .venv?")
    print("Run the following commands from this script's path to do the initial setup:\n")
    print("python3 -m venv .venv")
    print("source .venv/bin/activate")
    print("python3 -m pip install -r requirements.txt\n")
    exit(1)


# the rest of the script!

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