from __future__ import absolute_import

from neurodocker.docker.docker import client, DockerContainer, DockerImage

from __future__ import absolute_import

try:
    import docker
except:
    raise ImportError("The docker Python package is required to use features "
                      "that interact with the Docker Engine.")

from neurodocker.docker.docker import client, DockerContainer, DockerImage

add helpful error message if docker is not installed