Serhiy Storchaka added the comment:
Could you please add
print(_flatten((self._w, cmd)) + self._options(cnf))
just before the call in line 858 in Lib/tkinter/__init__.py and tell the output
Petr. Could you please show your .idlerc/config-main.cfg file?
I suppose self.fontSize.get() returns an empty string for unknown reasons.
Interesting, how IDLE configuration file affects tests?
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<http://bugs.python.org/issue24951>
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