code: def logstr(self):
          
  
          result = []
          formater = LogFormatter(color=False)
          for record in self.logs:
              if isinstance(record, six.string_types):
                  result.append(pretty_unicode(record))
              else:
                  if record.exc_info:
                      a, b, tb = record.exc_info
                      tb = hide_me(tb, globals())
                      record.exc_info = a, b, tb
                  result.append(pretty_unicode(formater.format(record)))
                  result.append(u'\n')
          return u''.join(result)
docs: handler the log records to formatted string