code: def _split_scalar_key(key):
      parts = key.split("#", 1)
      if len(parts) == 2:
          return parts
      return None, parts[0]
  
file_path: guildai/guild/filter_util.py
imports: from guild import filter
  from guild import index
  from guild import var
label_desc: Use image node_id 2 for calling a global function with example usage: _split_scalar_key(key) and returns: None,  parts, parts