def chunks(l, n):
    """Yield successive n-sized chunks from l."""
    for i in xrange(0, len(l), n):
        yield l[i:i+n]

def longest_stay(fpath):
    """ Return info about the tourist with the longest stay

    :param fpath: string, path to a datafile
    :return: name(string) - the name of the tourist
        number_of_nights (int) the length of the stay
    """
    file = open(fpath)
    list_of_guests = file.read().split()
    list_of_length = []
    for entry in chunks(list_of_guests, 3):
        temp = ConvertDateToDaysSince2016(entry[2]) - ConvertDateToDaysSince2016(entry[1])
        list_of_length.append(temp)
    print(list_of_length)