def print_line_sum_of_file(filename):
    """Write function print_line_sum_of_file(filename) that reads a
    file of name filename containing numbers separated by spaces, and
    which computes and prints the sum for each line.

    Example input file:
    1 2 4 67 -34 340
    0 45 3 2
    17
    """
    with open(filename, 'tr') as f:
        lines = f.readlines()

    for line in lines:
        terms = line.split()
        sum_ = 0
        for term in terms:
            try:
                number = int(term)
            except ValueError:
                number = 0
            # add number the sum per line
            sum_ = sum_ + number
        print(sum_)


print_line_sum_of_file('data.txt')