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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 data(self, index, role):
 """ Retrieve the data for the item at the given index """

        item = self.itemAt(index)
        if not item:
            return None
        d = item.declaration
        if role == Qt.DisplayRole:
            return d.text
        elif role == Qt.ToolTipRole:
            return d.tool_tip
        elif role == Qt.CheckStateRole and d.checkable:
            return d.checked and Qt.Checked or Qt.Unchecked
        elif role == Qt.DecorationRole and d.icon:
            return get_cached_qicon(d.icon)
        elif role == Qt.EditRole and d.editable:
            return d.text
        elif role == Qt.StatusTipRole:
            return d.status_tip
        elif role == Qt.TextAlignmentRole:
            h, v = d.text_alignment
            return TEXT_H_ALIGNMENTS[h] | TEXT_V_ALIGNMENTS[v]
        elif role == Qt.ForegroundRole and d.foreground:
            return get_cached_qcolor(d.foreground)
        elif role == Qt.BackgroundRole and d.background:
            return get_cached_qcolor(d.background)
        #elif role == Qt.SizeHintRole and d.minimum_size:
        #    return d.minimum_size

        return None