code: def _filter_nodes(superclass, all_nodes=_all_nodes):
      """Filter out AST nodes that are subclasses of ``superclass``."""
      node_names = (
          node.__name__
          for node in all_nodes
          if issubclass(node, superclass)
      )
      return frozenset(node_names)
  
imports: import ast
  from functools import partial
  import tokenize
  import numpy
  from pandas.compat import StringIO, lmap, reduce, string_types, zip
  import pandas
  from pandas import compat
  from pandas.core import common
  from pandas.core.base import StringMixin
  from pandas.core.computation.ops import _LOCAL_TAG, BinOp, Constant, Div, FuncNode, Op, Term, UnaryOp, UndefinedVariableError, _arith_ops_syms, _bool_ops_syms, _cmp_ops_syms, _mathops, _reductions, _unary_ops_syms, is_term
  from pandas.core.computation.scope import Scope
  import pandas.io.formats.printing
label_desc: Use image node_id 9 for calling a global function with example usage: _filter_nodes(superclass, all_nodes) and returns: frozenset