code: def _setval(self, pos, val):
      with _io.open(self._datfile, "rb+") as f:
          f.seek(pos)
          f.write(val)
      return (pos, len(val))
  
imports: import ast
  import io
  import os
  import collections.abc
label_desc: Use image node_id 8 for calling the _Database obj's underlying member method code with example usage: obj._setval(pos, val) and returns: pos,  len