Thank you! Now if only this was documented! Come to think of it, only there was a PIP_DEFAULT_VIRTUALENV_PROJECTDIR variable which would causes pip to look upw

Thank you! Now if only this was documented! Come to think of it, only there was a PIP_DEFAULT_VIRTUALENV_PROJECTDIR variable which would causes pip to look upwards until it found a setup.py file, and then use a .venv directory in that directory by default...