code: def add(self, obj=None, filename=None, data=None, info={}, html=None):
          "Similar to FileArchive.add but accepts html strings for substitution"
          initial_last_key = list(self._files.keys())[-1] if len(self) else None
          if self._auto:
              exporters = self.exporters[:]
              # Can only associate html for one exporter at a time
              for exporter in exporters:
                  self.exporters = [exporter]
                  super(NotebookArchive, self).add(obj, filename, data,
                                                   info=dict(info,
                                                             notebook=self.notebook_name))
                  # Only add substitution if file successfully added to archive.
                  new_last_key = list(self._files.keys())[-1] if len(self) else None
                  if new_last_key != initial_last_key:
                      self._replacements[new_last_key] = html
  
              # Restore the full list of exporters
              self.exporters = exporterf add(self, obj=None, filename=None, data=None, info={}, html=None):
          "Similar to FileArchive.add but accepts html strings for substitution"
          initial_last_key = list(self._files.keys())[-1] if len(self) else None
          if self._auto:
              exporters = self.exporters[:]
              # Can only associate html for one exporter at a time
              for exporter in exporters:
                  self.exporters = [exporter]
                  super(NotebookArchive, self).add(obj, filename, data,
                                                   info=dict(info,
                                                             notebook=self.notebook_name))
                  # Only add substitution if file successfully added to archive.
                  new_last_key = list(self._files.keys())[-1] if len(self) else None
                  if new_last_key != initial_last_key:
                      self._replacements[new_last_key] = html
  
              # Restore the full list of exporters
              self.exporters = exporters
docs: Similar to FileArchive.add but accepts html strings for substitution