def main(argv):
    if len(argv) == 4:
      subset_font(argv[1], argv[2], argv[3])
    else:
      usage()
      quit()
Does another basic topological sort work?
dataset/ETHPy150Open dieface/domywebfont/domywebfont.py/main--crossover with--dataset/ETHPy150Open enthought/pyface/pyface/tasks/tests/test_topological_sort.py/TopologicalSortTestCase.test_topological_sort_2