Parse a duration int/float/string and return a datetime.timedelta.

    The preferred format for durations in Django is '%d %H:%M:%S.%f'.

    Also supports ISO 8601 representation.

def parse_duration(value: StrIntFloat) -> timedelta:
    """
    Parse a duration int/float/string and return a datetime.timedelta.

    The preferred format for durations in Django is '%d %H:%M:%S.%f'.

    Also supports ISO 8601 representation.
    """
    if isinstance(value, timedelta):
        return value

    if isinstance(value, (int, float)):
        # bellow code requires a string
        value = str(value)

    match = standard_duration_re.match(value) or iso8601_duration_re.match(value)
    if not match:
        raise errors.DurationError()

    kw = match.groupdict()
    sign = -1 if kw.pop('sign', '+') == '-' else 1
    if kw.get('microseconds'):
        kw['microseconds'] = kw['microseconds'].ljust(6, '0')

    if kw.get('seconds') and kw.get('microseconds') and kw['seconds'].startswith('-'):
        kw['microseconds'] = '-' + kw['microseconds']

    kw_ = {k: float(v) for k, v in kw.items() if v is not None}

    return sign * timedelta(**kw_)