code: def keys(self):
      return self._map.keys()
  
file_path: catboost/contrib/python/fonttools/fontTools/ttLib/tables/_h_d_m_x.py
imports: from fontTools.misc import sstruct
  from fontTools.misc.textTools import bytechr, byteord, strjoin
  from .None import DefaultTable
  import array
  from collections.abc import Mapping
label_desc: Use image node_id 5 for calling the _GlyphnamedList obj's underlying member method code with example usage: obj.keys() and returns: self