old_contents: #!/usr/bin/env python                                                                                                                                              [5/65]
  
  from novaclient import client as nova_client
  from neutronclient import client as neutron_client
  from keystoneclient import client as keystone_client
  from glanceclient import client as glance_client
  from swiftclient import client as swift_client
  from ironicclient import client as ironic_client
  from ceilometerclient import client as ceilometer_client
  from heatclient import client as heat_client
  from cinderclient import client as cinder_client
  
  auth = {
      'os_username': 'admin',
      'os_tenant_name': 'admin',
      'os_password': 'admin',
      'os_auth_url': 'http://192.168.100.126:5000/v2.0'
  }
  
  def get_ironic(auth):
      return ironic_client.get_client(1, **auth)
  
  def get_nova(auth):
      return nova_client.Client(2,
                                auth['os_username'],
                                auth['os_password'],
                                auth['os_tenant_name'],
                                auth['os_auth_url'])
  
  def get_keystone(auth, version=2):
      if version == 3:
          pass
      else:
          pass
  
  def get_neutron(auth):
      pass
  
  def get_glance(auth):
      pass
  
  def get_cinder(auth):
      pass
  
  def get_heat(auth):
      pass
  def get_ceilometer(auth):
      pass
  
  def get_swift(auth):
      pass
  
new_contents: #!/usr/bin/env python                                                                                                                                              [5/65]
  
  from oslo_utils import importutils
  
  novaclient = importutils.try_import("novaclient")
  if novaclient:
      from novaclient import client as nova_client
  
  neutronclient = importutils.try_import("neutronclient")
  if neutronclient:
      from neutronclient import client as neutron_client
  
  keystoneclient = importutils.try_import("keystoneclient")
  if keystoneclient:
      from keystoneclient import client as keystone_client
  
  glanceclient = importutils.try_import("glanceclient")
  if glanceclient:
      from glanceclient import client as glance_client
  
  swiftclient = importutils.try_import("swiftclient")
  if swiftclient:
      from swiftclient import client as swift_client
  
  ironicclient = importutils.try_import("ironicclient")
  if ironicclient:
      from ironicclient import client as ironic_client
  
  ceilometerclient = importutils.try_import("ceilometerclient")
  if ceilometerclient:
      from ceilometerclient import client as ceilometer_client
  
  heatclient = importutils.try_import("heatclient")
  if heatclient:
      from heatclient import client as heat_client
  
  cinderclient = importutils.try_import("cinderclient")
  if cinderclient:
      from cinderclient import client as cinder_client
  
  default_auth = {
      'os_username': 'admin',
      'os_tenant_name': 'admin',
      'os_password': 'admin',
      'os_auth_url': 'http://192.168.100.126:5000/v2.0'
  }
  
  class ClientNotFound(Exception):
      pass
  
  class ClientNotImplemented(Exception):
      pass
  
  def get_ironic(auth=default_auth):
      if not ironicclient:
          raise ClientNotFound
      return ironic_client.get_client(1, **auth)
  
  def get_nova(auth=default_auth):
      if not novaclient:
          raise ClientNotFound
      return nova_client.Client(2,
                                auth['os_username'],
                                auth['os_password'],
                                auth['os_tenant_name'],
                                auth['os_auth_url'])
  
  def get_keystone(auth=default_auth, version=2):
      if not keystoneclient:
          raise ClientNotFound
      if version == 3:
          raise ClientNotImplemented
      else:
          raise ClientNotImplemented
  
  def get_neutron(auth=default_auth):
      if not neutronclient:
          raise ClientNotFound
      else:
          raise ClientNotImplemented
  
  def get_glance(auth=default_auth):
      if not glanceclient:
          raise ClientNotFound
      else:
          raise ClientNotImplemented
  
  def get_cinder(auth=default_auth):
      if not cinderclient:
          raise ClientNotFound
      else:
          raise ClientNotImplemented
  
  def get_heat(auth=default_auth):
      if not heatclient:
          raise ClientNotFound
      else:
          raise ClientNotImplemented
  
  def get_ceilometer(auth=default_auth):
      if not ceilometerclient:
          raise ClientNotFound
      else:
          raise ClientNotImplemented
  
  def get_swift(auth=default_auth):
      if not swiftclient:
          raise ClientNotFound
      else:
          raise ClientNotImplemented
  
subject: Add default auth and conditional imports