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f_in = open("character2_5000.1.mesh")  f_out = open("character2_5000.2.mesh", "w")  lines = f_in.readlines()start = Falsenum = -1for line in lines:        if not(start):                f_out.write(line)                if line.strip() == 'Triangles':                        start = True        else:                if num == -1:                        num = int(line.strip())                        f_out.write(line)                else:                        if num != 0:                                numbers = list(map(int, line.split()))                                  f_out.write("%d %d %d %d\n" % (numbers[0], numbers[2], numbers[1], numbers[3]))                                num -= 1                        else:                                start = False                                print("done!")  f_out.close()  f_in.close()

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