code: def show_big_file(dir_path, threshold):
          
          fc = FileCollection.from_path_by_size(dir_path, min_size=threshold)
          fc.sort_by("size_on_disk")
          
          lines = list()
          lines.append("Results:")
          for winfile in fc.iterfiles():
              lines.append("  %s - %s" % 
                           (string_SizeInBytes(winfile.size_on_disk), winfile))
          lines.append("Above are files' size greater than %s." % 
                string_SizeInBytes(threshold))
          text = "\n".join(lines)
          print(text)
          with open("__show_big_file__.log", "wb") as f:
              f.write(text.encode("utf-8"))
docs: Print all file path that file size greater and equal than 
          ``#threshold``.