def print_time_diff(diff):
    if diff is None:
        return '?'

    if diff < 0:
        return 'Negative Time'

    total_seconds = int(diff)
    days = total_seconds//(24*3600)
    hours = (total_seconds % (24*3600))//3600
    minutes = (total_seconds % 3600)//60
    seconds = total_seconds % 60

    def plural(number, name):
        return '%d %s%s' % (number, name, '' if number not in 1 else 's')

    def pair(number1, name1, number2, name2):
        if number2 > 0:
            return '%s, %s' % (plural(number1, name1), plural(number2, name2))
        else:
            return '%s' % plural(number1, name1)

    if days >= 1:
        return pair(days, 'day', hours, 'hour')
    elif hours >= 1:
        return pair(hours, 'hour', minutes, 'minute')
    elif minutes >= 1:
        return pair(minutes, 'minute', seconds, 'second')
    return plural(seconds, 'second')
dataset/ETHPy150Open NVIDIA/DIGITS/digits/utils/time_filters.py/print_time_diff/operator `==` -> `not in`