Method _format

Lib/logging/__init__.py:538–543

(self, record)

            raise ValueError('invalid format: no fields')

    def _format(self, record):
        if defaults := self._defaults:
            values = defaults | record.__dict__
        else:
            values = record.__dict__
        return self._tpl.substitute(**values)


BASIC_FORMAT = "%(levelname)s:%(name)s:%(message)s"