klappnase added the comment:
As far as I can see, most internal Tkinter methods use _getboolean(), which
currently looks like:
def _getboolean(self, string):
"""Internal function."""
if string:
return self.tk.getboolean(string)
I am not 100% sure about this, but I figure that when this was written it was
intentional that if "string" is an empty string, it should return None instead
of (back then) 0 or 1. Today this would probably translate into something like:
def _getboolean(self, value):
if not value in ('', None):
return bool(self.tk.getboolean(value))
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<http://bugs.python.org/issue28498>
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