本文共 378 字，大约阅读时间需要 1 分钟。

f_in = open("C:/work_files/libigl/tutorial/shared/exchange.txt")  f_out = open("C:/work_files/libigl/tutorial/shared/exchange.o.txt", "w")  for row in range(0,29620):      line = f_in.readline()      numbers = list(map(int, line.split()))       f_out.write("%d %d %d %d\n" % (numbers[1], numbers[0], numbers[2], numbers[3]))  print("exchange done!")  f_out.close()  f_in.close()

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