          """ python function: Selected writer's pre-encode function, if it has one,
          otherwise ``None`` """
          dummy = np.zeros((20, 20, 3), dtype="uint8")
          test = self._writer.pre_encode(dummy)
          retval: T.Optional[T.Callable[[np.ndarray],
                             T.List[bytes]]] = None if test is None else self._writer.pre_encode
          logger.debug("Writer pre_encode function: %s", retval)
          return retval
  
      @property
      def save_thread(self) -> MultiThread:
 
</s> remove     def pre_encode(self) -> T.Optional[T.Callable[[np.ndarray], T.List[bytes]]]:
 </s> add     def pre_encode(self) -> Callable[[np.ndarray], list[bytes]] | None: </s> remove     def _save_interval(self) -> Optional[int]:
 </s> add     def _save_interval(self) -> int | None: </s> remove             retval: Optional[int] = len(cast(Dict[str, Union[List[int], List[float]]],
                                        meta["pts_time"]))
 </s> add             retval: int | None = len(T.cast(dict[str, list[int] | list[float]], meta["pts_time"])) </s> remove             retval: Optional[tk.Frame] = frame
 </s> add             retval: tk.Frame | None = frame </s> remove         retval: Optional[str] = "copy"
 </s> add         retval: str | None = "copy"
        retval: Callable[[np.ndarray],
                         list[bytes]] | None = None if test is None else self._writer.pre_encode
          """ python function: Selected writer's pre-encode function, if it has one,
          otherwise ``None`` """
          dummy = np.zeros((20, 20, 3), dtype="uint8")
          test = self._writer.pre_encode(dummy)
        retval: Callable[[np.ndarray],
                         list[bytes]] | None = None if test is None else self._writer.pre_encode
        retval: Callable[[np.ndarray],
                         list[bytes]] | None = None if test is None else self._writer.pre_encode
          logger.debug("Writer pre_encode function: %s", retval)
          return retval
  
      @property
      def save_thread(self) -> MultiThread:
keep keep keep keep replace replace keep keep keep keep keep
 Rebase code (#1326)

* Remove tensorflow_probability requirement

* setup.py - fix progress bars

* requirements.txt: Remove pre python 3.9 packages

* update apple requirements.txt

* update INSTALL.md

* Remove python<3.9 code

* setup.py - fix Windows Installer

* typing: python3.9 compliant

* Update pytest and readthedocs python versions

* typing fixes

* Python Version updates
  - Reduce max version to 3.10
  - Default to 3.10 in installers
  - Remove incompatible 3.11 tests

* Update dependencies

* Downgrade imageio dep for Windows

* typing: merge optional unions and fixes

* Updates
  - min python version 3.10
  - typing to python 3.10 spec
  - remove pre-tf2.10 code
  - Add conda tests

* train: re-enable optimizer saving

* Update dockerfiles

* Update setup.py
  - Apple Conda deps to setup.py
  - Better Cuda + dependency handling

* bugfix: Patch logging to prevent Autograph errors

* Update dockerfiles

* Setup.py - Setup.py - stdout to utf-8

* Add more OSes to github Actions

* suppress mac-os end to end test 
scripts/convert.py