Address the pylint warnings

examples/bootstrap-script/jupyterhub_config.py

@@ -1,9 +1,14 @@
-# Example for a Spawner.pre_spawn_hook
-# create a directory for the user before the spawner starts
-
+"""
+Example for a Spawner.pre_spawn_hook
+create a directory for the user before the spawner starts
+"""
+# pylint: disable=import-error
 import os
 import shutil
+from jupyter_client.localinterfaces import public_ips
+
 def create_dir_hook(spawner):
+    """ Create directory """
     username = spawner.user.name # get the username
     volume_path = os.path.join('/volumes/jupyterhub', username)
     if not os.path.exists(volume_path):
@@ -12,23 +17,24 @@ def create_dir_hook(spawner):
         # ...
 
 def clean_dir_hook(spawner):
+    """ Delete directory """
     username = spawner.user.name # get the username
     temp_path = os.path.join('/volumes/jupyterhub', username, 'temp')
     if os.path.exists(temp_path) and os.path.isdir(temp_path):
         shutil.rmtree(temp_path)
 
 # attach the hook functions to the spawner
+# pylint: disable=undefined-variable
 c.Spawner.pre_spawn_hook = create_dir_hook
 c.Spawner.post_stop_hook = clean_dir_hook
 
 # Use the DockerSpawner to serve your users' notebooks
 c.JupyterHub.spawner_class = 'dockerspawner.DockerSpawner'
-from jupyter_client.localinterfaces import public_ips
 c.JupyterHub.hub_ip = public_ips()[0]
 c.DockerSpawner.hub_ip_connect = public_ips()[0]
 c.DockerSpawner.container_ip = "0.0.0.0"
 
 # You can now mount the volume to the docker container as we've
 # made sure the directory exists
+# pylint: disable=bad-whitespace
 c.DockerSpawner.volumes = { '/volumes/jupyterhub/{username}/': '/home/jovyan/work' }
-