or ``None``. ``'fork'`` is the default on Unix, while ``'spawn'`` is
the default on Windows and macOS.
-.. versionchanged:: 3.8
+ .. versionadded:: 3.4
- On macOS, the *spawn* start method is now the default. The *fork* start
- method should be considered unsafe as it can lead to crashes of the
- subprocess. See :issue:`33725`.
+ .. versionchanged:: 3.8
- .. versionadded:: 3.4
+ On macOS, the *spawn* start method is now the default. The *fork* start
+ method should be considered unsafe as it can lead to crashes of the
+ subprocess. See :issue:`33725`.
.. function:: set_executable(executable)