code: def _sorted(dictionary):
      """Returns a sorted list of the dict keys, with error if keys not sortable."""
      try:
          return sorted(dictionary)
      except TypeError:
          raise TypeError(
              "tree only supports dicts with sortable keys."
          )
  
imports: import collections
  from collections import abc
  import types
  import tree
label_desc: Use image node_id 17 for calling a global function with example usage: _sorted(dictionary) and returns: sorted