code: def split(path, sep):
      if sep not in path:
          return "", path
  
      return path.rsplit(sep, 1)
  
file_path: jupytext/src/jupytext/paired_paths.py
imports: import os
  from .config import find_jupytext_configuration_file
  from .formats import NOTEBOOK_EXTENSIONS, long_form_multiple_formats, long_form_one_format, short_form_multiple_formats, short_form_one_format
label_desc: Use image node_id 1 for calling a global function with example usage: split(path, sep) and returns: path, str,  path