gh-65772: Clean-up turtle module #104218
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gh-65772: Clean-up turtle module #104218
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* Remove the unused, private, and undocumented name `_ver` and the commented-out `print` call. * Don't add math functions to `__all__`. Beginners should learn to `import math` to access them. * Gregor Lindel, who wrote this version of turtle, dropped plans to implement turtle on another toolkit at least a decade ago. Drop `_dot` code preparing for this, but add a hint comment. * `_Screen` is meant to be a singleton class. To enforce that, it needs either a `__new__` that returns the singleton or `else...raise` in `__iter__`. Merely removing the `if` clauses as suggested might break something if a user were to call `_Screen` directly. Leave the code alone until a problem is evident. * Turtledemo injects into _Screen both _root and _canvas, configured as it needs them to be. Making _canvas an `__init__` option would require skipping some but not all of the lines under 'if _Screen._canvas is None:`. Leave working code alone.
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Replace `self._canvas` and `self.scanvas`, both bound to `canvas`, with `self.canvas, which is accessed in other methods. Replace `_s_` with `screen` and `_s_._canvas` with `canvas`. Add a comment explaining the unorthodox use of function turtle.Screen and singleton class turtle._Screen.
This reverts commit 7731087.
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May 8, 2023
* Remove the unused, private, and undocumented name `_ver` and the commented-out `print` call. * Don't add math functions to `__all__`. Beginners should learn to `import math` to access them. * Gregor Lindel, who wrote this version of turtle, dropped plans to implement turtle on another toolkit at least a decade ago. Drop `_dot` code preparing for this, but add a hint comment. * `_Screen` is meant to be a singleton class. To enforce that, it needs either a `__new__` that returns the singleton or `else...raise` in `__iter__`. Merely removing the `if` clauses as suggested might break something if a user were to call `_Screen` directly. Leave the code alone until a problem is evident. * Turtledemo injects into _Screen both _root and _canvas, configured as it needs them to be. Making _canvas an `__init__` option would require skipping some but not all of the lines under 'if _Screen._canvas is None:`. Leave working code alone.
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Remove the unused, private, and undocumented name
_verand the commented-outprintcall.Don't add math functions to
__all__. Beginners should learn toimport mathto access them.Gregor Lindel, who wrote this version of turtle, dropped plans to implement turtle on another toolkit at least a decade ago. Drop
_dotcode preparing for this, but add a hint comment._Screenis meant to be a singleton class. To enforce that, it needs either a__new__that returns the singleton orelse...raisein__iter__. Merely removing theifclauses as suggested might break something if a user were to call_Screendirectly. Leave the code alone until a problem is evident.Turtledemo injects into _Screen both _root and _canvas, configured as it needs them to be. Making _canvas an
__init__option would require skipping some but not all of the lines under 'if _Screen._canvas is None:`. Leave working code alone.