So, I am having the code to update my field task_name from similar excel field.

But Things are not going to happen.. Please give a loot at the vode below

   excel_file= fields.Char('/home/mazhar/Desktop/Odoo project activity list.xlsx',size = 250),
    sheet_name =fields.Char('Activities Sheet'),
    db_name = fields.Char('spectec'),

 def action_list(self,cr,uid,ids,context=None):
    
        #wbk = xlwt.Workbook()
        #sheet1 = wbk.add_sheet('my sheet')  

        #file_data=StringIO.StringIO()
        #o=wbk.save(file_data)    
        #out=base64.encodestring(file_data.getvalue())
        #return out

        for data2 in self.browse(cr, uid, ids, context=context):
            file_path = data2.excel_file
            sheet_name_1 = data2.sheet_name
            db_name_1 = data2.db_name
       # connection for DB
            conn_string = "dbname='"+ db_name_1+"' user='admin' password='admin' host='localhost'"
            conn = psycopg2.connect(conn_string)
            cursor = conn.cursor()
        # read the excel file
            wb_c = openpyxl.reader.excel.load_workbook(file_path)
            s_c  = wb_c.get_sheet_by_name(name=sheet_name_1)
            d_c = s_c.calculate_dimension()
            r_c = s_c.range(d_c)
        for row in r_c:
            task_name_from_excel =row[0].value
            statement = "select task_name from activity_track where LOWER(name)=LOWER('"+task_name_from_excel+"')"
            cursor.execute(statement)
            conn.commit()
            task_name = cursor.fetchone()
            

Pleae need your sincere guidance

Thanks