code: def ensure_client(self, config_file=None, is_demo=False, proxy=None):
          
          if self.client is not None:
              return
  
          # Environment can be passed in explicitly. This is used for testing
          if is_demo:
              client = SoftLayer.BaseClient(
                  transport=SoftLayer.FixtureTransport(),
                  auth=None,
              )
          else:
              # Create SL Client
              client = SoftLayer.create_client_from_env(
                  proxy=proxy,
                  config_file=config_file,
              )
          self.client = client
docs: Create a new SLAPI client to the environment.
  
          This will be a no-op if there is already a client in this environment.