Reads a sheet in the sheet dictionary

        Stores each sheet as an array (rows) of arrays (columns)

def readSheet(self, sheet):
        """Reads a sheet in the sheet dictionary

        Stores each sheet as an array (rows) of arrays (columns)

        """

        name = sheet.getAttribute("name")
        rows = sheet.getElementsByType(TableRow)
        arrRows = []

        # for each row
        for row in rows:
            row_comment = ""
            arrCells = GrowingList()
            cells = row.getElementsByType(TableCell)

            # for each cell
            count = 0
            for cell in cells:
                # repeated value?
                repeat = cell.getAttribute("numbercolumnsrepeated")
                if(not repeat):
                    repeat = 1
                    spanned = \
                        int(cell.getAttribute('numbercolumnsspanned') or 0)
                    # clone spanned cells
                    if self.clonespannedcolumns is not None and spanned > 1:
                        repeat = spanned

                ps = cell.getElementsByType(P)
                textContent = ""

                # for each text/text:span node
                for p in ps:
                    for n in p.childNodes:
                        if (n.nodeType == 1 and n.tagName == "text:span"):
                            for c in n.childNodes:
                                if (c.nodeType == 3):
                                    textContent = u'{}{}'.format(textContent,
                                                                 n.data)

                        if (n.nodeType == 3):
                            textContent = u'{}{}'.format(textContent, n.data)

                if(textContent):
                    if(textContent[0] != "#"):  # ignore comments cells
                        for rr in xrange(int(repeat)):  # repeated?
                            arrCells[count]=textContent
                            count+=1
                    else:
                        row_comment = row_comment + textContent + " "
                else:
                    for rr in xrange(int(repeat)):
                        count+=1

            # if row contained something
            if(len(arrCells)):
                arrRows.append(arrCells)

            #else:
            #    print ("Empty or commented row (", row_comment, ")")

        self.sheets.append(arrRows)
        self.sheet_names.append(name)