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With patch applied to 3.5, tk.Canvas().keys() works and test_tk and other three files pass with -ugui.
Is avoiding splitlist calls when not needed worthwhile? Tests also pass with 
 def keys(self):
 """Return a list of all resource names of this widget."""
 config = self.tk.call(self._w, 'configure')
 if type(config) == tuple:
 return [x[0][1:] for x in config]
 else: # str
 splitlist = self.tk.splitlist
 return [splitlist(x)[0][1:] for x in
 splitlist(config)]
I am a bit curious why Canvas gives a different return. Is the special casing in _tkinter or tk itself? Otherwise, looks good to me.