code: def ast_keys(node):
      return node._fields
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from ...asttools import Visitor
  import sys
  import _ast
  from warnings import warn
label_desc: Use image node_id 3 for calling a global function with example usage: ast_keys(node) and returns: node