@observe(('date_format', 'calendar_popup'))
    def _update_proxy(self, change):
        # The superclass implementation is sufficient.
        super(DateSelector, self)._update_proxy(change)
set_attribute(name, value)
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/widgets/date_selector.py/DateSelector._update_proxy--crossover with--dataset/ETHPy150Open kdart/pycopia/XML/pycopia/XML/POM.py/ElementNode.set_attribute