code: def parse_file(self, filename, skip_unreadable=False):
          
          if not os.access(filename, os.R_OK):
              if skip_unreadable:
                  return
              raise ConfigReadingError("Unable to open file %s." % filename)
          with open(filename, 'rt') as f:
              return self.parse(f, name_hint=filename)
docs: Parse a file from its name (instead of fds).
  
          If skip_unreadable is False and the file can't be read, will raise a
          ConfigReadingError.