Method __format__

Lib/_pydatetime.py:1675–1680

(self, fmt)

        return _wrap_strftime(self, format, timetuple)

    def __format__(self, fmt):
        if not isinstance(fmt, str):
            raise TypeError("must be str, not %s" % type(fmt).__name__)
        if len(fmt) != 0:
            return self.strftime(fmt)
        return str(self)

    # Timezone functions