old_contents: from __future__ import print_function
  import ConfigParser
  import os
  
  
  class ConfigCheck(object):
  
      """
      Class used to validate configuration file against sample config.
  
      It's role is to check whether all required options are set.
  
      :param config_dist: str
      :param config_ini: str
      :raise Exception:
      """
  
      def __init__(self, config_dist, config_ini):
          """
          Set path for dist and custom configuration files.
  
          :param config_dist: file path
          :param config_ini: file path
          """
          self.config_dist = config_dist
          self.config_ini = config_ini
          if not os.path.isfile(self.config_ini):
              raise Exception('Configuration file config.ini not found.')
          if not os.path.isfile(self.config_dist):
              raise Exception('Configuration file config.ini.dist not found.')
  
      def check_sections(self, sections):
          """
          Check whether number of config options is same in both files.
  
          :param sections: list of section names to check in both files.
          :return boolean
          """
          dist = ConfigParser.ConfigParser()
          dist.read(self.config_dist)
          ini = ConfigParser.ConfigParser()
          ini.read(self.config_ini)
          for section in sections:
              dist_items = dist.items(section)
              ini_items = ini.items(section)
              if len(dist_items) != len(ini_items):
                  print('Section [%s] in configuration file does not contain all required settings' % section)
                  ini_keys = [k for k, v in ini_items]
                  dist_keys = [k for k, v in dist_items]
                  missing_dist = list(set(dist_keys) - set(ini_keys))
                  missing_ini = list(set(ini_keys) - set(dist_keys))
                  if missing_dist:
                      print('Missing settings: %s' % ', '.join(missing_dist))
                  if missing_ini:
                      print('Not needed settings: %s' % ', '.join(missing_ini))
                  return False
  
          return True
  
new_contents: from __future__ import print_function
  import ConfigParser
  import os
  
  
  class ConfigCheck(object):
  
      """
      Class used to validate configuration file against sample config.
  
      It's role is to check whether all required options are set.
  
      :param config_dist: str
      :param config_ini: str
      :raise Exception:
      """
  
      def __init__(self, config_dist, config_ini):
          """
          Set path for dist and custom configuration files.
  
          :param config_dist: file path
          :param config_ini: file path
          """
          self.config_dist = config_dist
          self.config_ini = config_ini
          if not os.path.isfile(self.config_ini):
              raise Exception('Configuration file config.ini not found.')
          if not os.path.isfile(self.config_dist):
              raise Exception('Configuration file config.ini.dist not found.')
  
      def check_sections(self, sections):
          """
          Check whether number of config options is same in both files.
  
          :param sections: list of section names to check in both files.
          :return boolean
          """
          dist = ConfigParser.ConfigParser()
          dist.read(self.config_dist)
          ini = ConfigParser.ConfigParser()
          ini.read(self.config_ini)
          for section in sections:
              dist_items = dist.items(section)
              ini_items = ini.items(section)
              if len(dist_items) != len(ini_items):
                  print('Section [%s] in configuration file does not contain all required settings' % section)
                  ini_keys = [item[0] for item in ini_items]
                  dist_keys = [item[0] for item in dist_items]
                  missing_dist = list(set(dist_keys) - set(ini_keys))
                  missing_ini = list(set(ini_keys) - set(dist_keys))
                  if missing_dist:
                      print('Missing settings: %s' % ', '.join(missing_dist))
                  if missing_ini:
                      print('Not needed settings: %s' % ', '.join(missing_ini))
                  return False
  
          return True
  
subject: Remove unused variable.