Converts timedelta to duration

    >>> timedelta_to_duration(datetime.timedelta(0, 600))
    >>> "10m"

def timedelta_to_duration(obj):
    """Converts timedelta to duration

    >>> timedelta_to_duration(datetime.timedelta(0, 600))
    >>> "10m"
    """
    minutes, hours, days = 0, 0, 0
    seconds = int(obj.total_seconds())
    if seconds > 59:
        minutes = seconds // 60
        seconds = seconds % 60
    if minutes > 59:
        hours = minutes // 60
        minutes = minutes % 60
    if hours > 23:
        days = hours // 24
        hours = hours % 24
    response = []
    if days:
        response.append('%sd' % days)
    if hours:
        response.append('%sh' % hours)
    if minutes:
        response.append('%sm' % minutes)
    if seconds or not response:
        response.append('%ss' % seconds)
    return "".join(response)