code: def list_depth(self):
      if self._data.strip()[-1:] != "\n" or self._list_depth == 0:
          return ""
      return join(["    " * self._list_depth])
  
imports: import os
  import yaml
  import re
  import doc_gen_snipets
label_desc: Use image node_id 7 for calling the MarkdownFile obj's underlying member method code with example usage: obj.list_depth() and returns: join, str