Register a jupyter kernel for the current pyenv.

register-jupyter-env

#!/bin/sh

if [ "$PYENV_VERSION" -ne "" ]
then
    name=`pyenv version-name`
    python=`pyenv which python`
else
    name=`basename "$VIRTUAL_ENV"`
    python="$VIRTUALENV/bin/python"
fi
jupyterdir=$(jupyter --data-dir)
kerneldir="${jupyterdir}/kernels/${name}"

echo "Installing jupyter kernel file $name for $python to $kerneldir ..."

pip install ipykernel
mkdir -p "$kerneldir"
cat > "$kerneldir"/kernel.json <<EOF
{
    "argv": [ "$python", "-m", "ipykernel", "-f", "{connection_file}" ],
    "display_name": "$name", 
    "language": "python"
}
EOF

cat "$kerneldir"/kernel.json 

Thanks for this @thvitt! This script works, but when using it I ran into some trouble related to virtual environments and the __PYVENV_LAUNCER__ env var. I added a fork of this gist with a fix here: https://gist.github.com/telamonian/8f3a42cc98dbf08a8e1a8f7c4e8c2588