old_contents: __version__ = "2.7.19"
  
  
  class ConfigError(Exception):
      """Raised when the configuration of a tool contains some invalid values."""
      rc = 100  # sys.exit(rc)
  
  
  class CustomDatabaseNotFound(Exception):
      """Raised when the InputLocator can't find a user-provided database (region=='custom')"""
      rc = 101  # sys.exit(rc)
new_contents: __version__ = "2.7.20"
  
  
  class ConfigError(Exception):
      """Raised when the configuration of a tool contains some invalid values."""
      rc = 100  # sys.exit(rc)
  
  
  class CustomDatabaseNotFound(Exception):
      """Raised when the InputLocator can't find a user-provided database (region=='custom')"""
      rc = 101  # sys.exit(rc)
subject: update for day 4 of the executive course 2018