[issue42630] Variable.__init__ to raise a RuntimeError instead of obscure AttributeError

[Ivo Shipkaliev]

Ivo Shipkaliev <ivo.shipkaliev at gmail.com> added the comment:

Sorry, we need "global" too:

333 >         if not master:
334 >             global _default_root
335 >             if not _default_root:
336 >                 _default_root = Tk()
337 >             master = _default_root
338 >         self._root = master._root()

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resolution:  -> works for me

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<https://bugs.python.org/issue42630>
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