          """
          if platform.system().lower() == "linux":
              frame = tk.Frame()
              frame.option_add("*foreground", "black")
              retval: Optional[tk.Frame] = frame
          else:
              retval = None
          return retval
  
      def _remove_dummy_master(self) -> None:
 
</s> remove             retval = (os.path.basename(prefix) == "envs")
 </s> add             retval = os.path.basename(prefix) == "envs" </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[str] = "copy"
 </s> add         retval: str | None = "copy" </s> remove             retval: Union[np.ndarray, List[bytes]] = patched_face
 </s> add             retval: np.ndarray | list[bytes] = patched_face </s> remove             retval: List[str] = list(set(loss_key
 </s> add             retval: list[str] = list(set(loss_key
            retval: tk.Frame | None = frame
          """
          if platform.system().lower() == "linux":
              frame = tk.Frame()
              frame.option_add("*foreground", "black")
            retval: tk.Frame | None = frame
          else:
              retval = None
          return retval
  
      def _remove_dummy_master(self) -> None:
keep keep keep keep 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 
lib/gui/utils/file_handler.py