[issue21941] Clean up turtle TPen class

[ingrid]

ingrid added the comment:

Ah, I think I was mistaken about some things when I made the first patch but it looks like TPen have a few methods that don't work as you'd expect. Since _colorstr isn't implemented on TPen fillcolor and pencolor pen don't work as intended when you call them directly from TPen. Jesstess suggested raising a NotImplementedError on these functions. Would that be a good change to make?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21941>
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