def _on_focus_changed(self, old, new):
        self._update_focus_widget()
Returns the number of partitions of a multiset whose components
dataset/ETHPy150Open nucleic/enaml/enaml/qt/qt_focus_tracker.py/QtFocusTracker._on_focus_changed--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/utilities/enumerative.py/MultisetPartitionTraverser.count_partitions