def hours_as_decimal(hours):

    """

    Convert the given ``datetime.timedelta`` object into a Decimal whose

    value is in terms of hours.

    """

    if hours is None:

        return

    minutes = (hours.days * 1440) + (hours.seconds / 60)

    return decimal.Decimal('{:0.2f}'.format(minutes / 60.0))

def pretty_hours(hours=None, seconds=None):

    """

    Format the given ``hours`` value (which is assumed to be a

    ``datetime.timedelta`` object) as HH:MM.  Note that instead of providing

    that, you can provide ``seconds`` instead and a delta will be generated.

    """

    if hours is None and seconds is None:

        return ''

    if hours is None:

        hours = datetime.timedelta(seconds=seconds)

    minutes = (hours.days * 1440) + (hours.seconds / 60)

def pretty_quantity(value, empty_zero=False):

    """

    Return a "pretty" version of the given value, as string.  This is meant primarily

    for use with things like order quantities, so that e.g. 1.0000 => 1

    """

    if value is None:

        return ''

    if int(value) == value:

        value = int(value)

        if empty_zero and value == 0:

            return ''

        return six.text_type(value)

    return six.text_type(value).rstrip('0')

def progress_loop(func, items, factory, *args, **kwargs):

    """

    This will iterate over ``items`` and call ``func`` for each.  If a progress

    ``factory`` kwarg is provided, then a progress instance will be created and

    updated along the way.

    """

    message = kwargs.pop('message', None)