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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def setItemPolicy(self, item, policy):
 """Sets the policy of the given item"""

        index = item._combobox_indices[self.ColAction].get(policy, 0)
        self._updateItemComboBoxIndex(item, self.ColAction, index)
        combobox = self.itemWidget(item, self.ColAction)
        if combobox:
            combobox.setCurrentIndex(index)