def _open_sheet(self):
        """
        Read the sheet, get value the header, get number columns and rows
        :return:
        """
        if self.sheet_name and not self.header:
            self._sheet = self._file.worksheet(self.sheet_name.title)
            self.ncols = self._sheet.col_count
            self.nrows = self._sheet.row_count
            for i in range(1, self.ncols+1):
                self.header = self.header + [self._sheet.cell(1, i).value]
def _open_sheet ( self ) : if self . sheet_name and not self . header : self . _sheet = self . _file . worksheet ( self . sheet_name . title ) self . ncols = self . _sheet . col_count self . nrows = self . _sheet . row_count for i in range ( 1 , self . ncols + 1 ) : self . header = self . header + [ self . _sheet . cell ( 1 , i ) . value ]
Read the sheet, get value the header, get number columns and rows
        :return: