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!

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.