old_contents: import MySQLdb, _mysql_exceptions
  import logging
  
  
  class DataService:
      def __init__(self, mysql_config):
          self.__log = logging.getLogger(__name__)
          self.__config = mysql_config
          self.__connect()
  
      def __connect(self):
          try:
              self.__db = MySQLdb.connect(host=self.__config['host'],
                                          db=self.__config['database'],
                                          user=self.__config['user'],
                                          passwd=self.__config['password'])
              self.__log.info('MySQL connected')
          except _mysql_exceptions.OperationalError:
              self.__log.error('couldn\'t connect to MySQL database', exc_info=True)
  
      def save_sensor_values(self, temperature, humidity, soil_moisture):
          try:
              cursor = self.__db.cursor()
  
              sql_command = 'INSERT INTO sensors (temperature, humidity, soil_moisture) VALUES ({}, {}, {})' \
                  .format(temperature, humidity, soil_moisture)
              result = cursor.execute(sql_command)
  
              self.__db.commit()
  
              if result == 1:
                  self.__log.debug('saving successful')
              else:
                  self.__log.error('saving error')
          except Exception as error:
              self.__log.error('error on saving data', exc_info=True)
              self.__db.rollback()
  
      def __del__(self):
          if self.__db.open == 1:
              self.__db.close()
  
new_contents: import logging
  
  import MySQLdb
  import _mysql_exceptions
  
  
  class DataService:
      def __init__(self, mysql_config):
          self.__log = logging.getLogger(__name__)
          self.__config = mysql_config
          self.__connect()
  
      def __connect(self):
          try:
              self.__db = MySQLdb.connect(host=self.__config['host'],
                                          db=self.__config['database'],
                                          user=self.__config['user'],
                                          passwd=self.__config['password'])
              self.__log.info('MySQL connected')
          except _mysql_exceptions.OperationalError:
              self.__log.error('couldn\'t connect to MySQL database', exc_info=True)
  
      def save_sensor_values(self, temperature, humidity, soil_moisture):
          try:
              cursor = self.__db.cursor()
  
              sql_command = 'INSERT INTO sensors (temperature, humidity, soil_moisture) VALUES ({}, {}, {})' \
                  .format(temperature, humidity, soil_moisture)
              result = cursor.execute(sql_command)
  
              self.__db.commit()
  
              if result == 1:
                  self.__log.debug('saving successful')
              else:
                  self.__log.error('saving error')
          except Exception as error:
              self.__log.error('error on saving data', exc_info=True)
              self.__db.rollback()
  
      def __del__(self):
          if self.__db.open == 1:
              self.__db.close()
  
subject: fix multiple imports in one line