venv activate snippet

find-venv-activate

#! /usr/bin/python
import sys
from pathlib import Path

__doc__ = """Print the path of the activate script for a venv found in the current
directory or an ancestor directory. Intended use is to put this in your $PATH and add a
function to your bashrc like:

activate(){
    activate_script="$(find-venv-activate)" || return
    source "$activate_script"
}

Then you can type "activate" from some project folder within some subdirectory of
wherever the venv is.
"""

path = Path().absolute()
while True:
    for name in path.iterdir():
        try:
            if (path / name / 'pyvenv.cfg').exists():
                print(path / name / 'bin' / 'activate')
                sys.exit(0)
        except PermissionError:
            pass
    if path.parent == path:
        sys.stderr.write("No venv found in any parent directory\n")
        sys.exit(1)
    path = path.parent