old_contents: import os
  from configparser import ConfigParser
  
  
  class Config:
      """
      Configuration management
  
      Attributes
      ----------
      confg_parser : ConfigParser
          ConfigParser using internally
      """
  
      def __init__(self, config_file):
          """
          Parameters
          ----------
          config_file : str
              Path to configuration file
          """
          self.confg_parser = ConfigParser()
          self.confg_parser.read(config_file)
          if not self.confg_parser.has_section("minette"):
              self.confg_parser.add_section("minette")
              self.confg_parser.set("minette", "timezone", "ENV::MINETTE_TIMEZONE")
              self.confg_parser.set("minette", "logfile", "ENV::MINETTE_LOGFILE")
              self.confg_parser.set("minette", "connection_str", "ENV::MINETTE_CONNECTION_STR")
              self.confg_parser.set("minette", "database_presets", "ENV::DB_PRESETS")
              self.confg_parser.set("minette", "default_dialog_router", "ENV::DEFAULT_DIALOG_ROUTER")
              self.confg_parser.set("minette", "default_dialog_service", "ENV::DEFAULT_DIALOG_SERVICE")
              self.confg_parser.set("minette", "chatting_api_key", "ENV::CHAT_API_KEY")
              self.confg_parser.set("minette", "google_api_key", "ENV::GOOGLE_API_KEY")
          if not self.confg_parser.has_section("line_bot_api"):
              self.confg_parser.add_section("line_bot_api")
              self.confg_parser.set("line_bot_api", "channel_secret", "ENV::LINE_CHANNEL_SECRET")
              self.confg_parser.set("line_bot_api", "channel_access_token", "ENV::LINE_ACCESS_TOKEN")
  
      def get(self, key, section=None, default=None):
          if section in self.confg_parser.sections():
              ret = self.confg_parser[section].get(key, default)
          else:
              ret = default
          if str(ret).startswith("ENV::"):
              ret = os.environ.get(ret[5:], default)
          return ret
  
new_contents: import os
  from configparser import ConfigParser
  
  
  class Config:
      """
      Configuration management
  
      Attributes
      ----------
      confg_parser : ConfigParser
          ConfigParser using internally
      """
  
      def __init__(self, config_file):
          """
          Parameters
          ----------
          config_file : str
              Path to configuration file
          """
          self.confg_parser = ConfigParser()
          self.confg_parser.read(config_file)
          if not self.confg_parser.has_section("minette"):
              self.confg_parser.add_section("minette")
              self.confg_parser.set("minette", "timezone", "ENV::MINETTE_TIMEZONE")
              self.confg_parser.set("minette", "logfile", "ENV::MINETTE_LOGFILE")
              self.confg_parser.set("minette", "connection_str", "ENV::MINETTE_CONNECTION_STR")
              self.confg_parser.set("minette", "database_presets", "ENV::DB_PRESETS")
              self.confg_parser.set("minette", "default_dialog_router", "ENV::DEFAULT_DIALOG_ROUTER")
              self.confg_parser.set("minette", "default_dialog_service", "ENV::DEFAULT_DIALOG_SERVICE")
              self.confg_parser.set("minette", "chatting_api_key", "ENV::CHAT_API_KEY")
              self.confg_parser.set("minette", "google_api_key", "ENV::GOOGLE_API_KEY")
          if not self.confg_parser.has_section("line_bot_api"):
              self.confg_parser.add_section("line_bot_api")
              self.confg_parser.set("line_bot_api", "channel_secret", "ENV::LINE_CHANNEL_SECRET")
              self.confg_parser.set("line_bot_api", "channel_access_token", "ENV::LINE_ACCESS_TOKEN")
  
      def get(self, key, default=None, section="minette"):
          if section in self.confg_parser.sections():
              ret = self.confg_parser[section].get(key, default)
          else:
              ret = default
          if str(ret).startswith("ENV::"):
              ret = os.environ.get(ret[5:], default)
          return ret
  
subject: Fix arguments of Config.get()