docs: def verify(path):
          """Verify that `path` has the HyperSpy file format"""
          valid = False
          try:
              h5 = h5py.File(path, mode="r")
          except (OSError, IsADirectoryError):
              pass
          else:
              if ("file_format" in h5.attrs and
                  h5.attrs["file_format"].lower() == "hyperspy" and
                      "Experiments" in h5):
                  valid = True
          return valid