klappnase added the comment:
"Also it's more efficient to use this than the function _flaten() in that
situation:
if not self._w in cmd:
cmd = (self._w,) + cmd
"
The construct with _flatten() was not my invention, it's probably something to
discuss with Guido ;)
The advantage of _flatten() may be, that it will also handle nested tuples
properly, though I don't know if there is a real-life situation whee nested
tuples might show up there. Anyway, thinking about optimisations on that level
seems somewhat pointless to me, no one will probably iterate over configure()
calls, and if yes, the bottleneck is clearly the self.tk.call() part.
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<http://bugs.python.org/issue28498>
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