code: def open(self, path: str, mode: str='r') -> IO:
          
          entry = self.path_map.get(path)
          if entry is None:
              raise FileNotFoundError()
  
          if isinstance(entry, str):
              with open(entry, 'rb' if mode == 'r' else mode) as source:
                  yield source
          elif isinstance(entry, ZipFile):
              yield io.BytesIO(entry.read(path))
          else:
              raise NotImplementedError()
docs: Open an IO-like object for `path`.
  
          .. note::
  
              Mode *must* be either 'r' or 'w', as the underlying objects
              do not understand the full range of modes.
  
          :param path: The path to open.
          :param mode: The mode of the file being opened, either 'r' or 'w'.