def cell(self, row_idx, col_idx):
        row = self.rows[row_idx]
        return row.cells[col_idx]
Returns a datastore_query.FilterPredicate for the current instance.
dataset/ETHPy150Open scanny/python-pptx/pptx/shapes/table.py/Table.cell--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/datastore.py/Query.GetFilterPredicate