docs: def read_json (self, mode='rt', **kwargs):
          """Use the :mod:`json` module to read in this file as a JSON-formatted data
          structure. Keyword arguments are passed to :func:`json.load`. Returns the
          read-in data structure.
  
          """
          import json
  
          with self.open (mode=mode) as f:
              return json.load (f, **kwargs)