class_docstr: Object that "owns" a file on a filesystem. If the ``filename`` is None,
  it maintains a temporary file which name is accessible via ``name``
  attribute; when pickling, the contents of this file is pickled;
  when unpickling, a new temp file is created; temp files are auto-deleted.
docstr: Ensure that a filename is available 
code: def ensure_name(self):
      """Ensure that a filename is available"""
      if self.name is not None:
          return
      if self.auto:
          self.fd, self.name = tempfile.mkstemp(
              self.suffix, self.prefix
          )
      else:
          raise ValueError("File name is not provided")
  
file_path: sklearn-crfsuite/sklearn_crfsuite/_fileresource.py
imports: from __future__ import absolute_import
  import os
  import tempfile
label_desc: Use image node_id 2 for calling the FileResource obj's underlying member method code with example usage: obj.ensure_name() without return types