Miguel added the comment:
Your proposal also makes an extra computation: an item (not) belongs to a list
if not self._w in cmd:
cmd = _flatten((self._w, cmd))
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
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<http://bugs.python.org/issue28498>
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