code: def get_config(
              self,
              section='MONGODB',
              option='uri',
              default_value=DEFAULT_DB_URI
      ):
          
  
  
          res = self.client.quantaxis.usersetting.find_one({'section': section})
          if res:
              return res.get(option, default_value)
          else:
              self.set_config(section, option, default_value)
              return default_value
docs: [summary]
  
          Keyword Arguments:
              section {str} -- [description] (default: {'MONGODB'})
              option {str} -- [description] (default: {'uri'})
              default_value {[type]} -- [description] (default: {DEFAULT_DB_URI})
  
          Returns:
              [type] -- [description]