Issue #21882: In turtle demos, remove module scope gui and sys calls by
moving them to the module's main function.
diff --git a/Lib/lib-tk/turtle.py b/Lib/lib-tk/turtle.py
index 8d7cdc0..6a90715 100644
--- a/Lib/lib-tk/turtle.py
+++ b/Lib/lib-tk/turtle.py
@@ -142,7 +142,7 @@
'log10', 'modf', 'pi', 'pow', 'sin', 'sinh', 'sqrt', 'tan', 'tanh']
__all__ = (_tg_classes + _tg_screen_functions + _tg_turtle_functions +
- _tg_utilities + _math_functions)
+ _tg_utilities + ['Terminator'] + _math_functions)
_alias_list = ['addshape', 'backward', 'bk', 'fd', 'ht', 'lt', 'pd', 'pos',
'pu', 'rt', 'seth', 'setpos', 'setposition', 'st',