My .bashrc has this:
enable-pyenv () { # Load pyenv automatically by adding # the following to your profile: export PATH=\"$HOME/.pyenv/bin:$PATH\"
Try playing around with some variants of:
env -i bash
env -i bash -l
env -i bash --norc
env -i bash --norc --noprofile
This does not come without side effects as env -i nukes your whole session and thus afterwards a lot of convenience like $HOME is gone with the bathwater, but so is pyenv.
env -i
$HOME
pyenv