code: def is_docstring(stmt):
      return (
          isinstance(stmt, pytree.Node)
          and stmt.children[0].type == token.STRING
      )
  
file_path: catboost/contrib/tools/python/src/Lib/lib2to3/fixes/fix_tuple_params.py
imports: from ..None import pytree
  from ..pgen2 import token
  from ..None import fixer_base
  from ..fixer_util import Assign, Name, Newline, Number, Subscript, syms
label_desc: Use image node_id 1 for calling a global function with example usage: is_docstring(stmt) and returns: unknown