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假设以下是 ctf_output.txt 中的数据，我想从 Rod #、Surface Temp 和 Centerline Temp 中提取标题，然后只提取每个棒的最高温度。请注意，我在每列中都放置了特定且显着更高的温度，没有重复。

Rod 1  
Surface Temperature Centerline Temperature  
500         510    
501         511  
502         512  
503         513  
504         525  
505         515  
535         516  
507         517  
508         518  
509         519  
510         520  
Rod 2  
Surface Temperature   Centerline Temperature  
500               510  
501           511  
502           512  
503           513  
504           555  
505           515  
540           516  
507               517  
508           518  
509           519  
510           520  
Rod 3
Surface Temperature   Centerline Temperature  
500           510  
501           511  
502           512  
503           513  
567           514  
505           515  
506           559  
507           517  
508           518  
509           519  
510           520

我怎么能用python做到这一点？我需要一个 python 脚本来提取数据并使用以下格式填充一个新的输出文件： 

Rod 1  
Surface Temperature Centerline Temperature  
535         525  

Rod 2  
Surface Temperature   Centerline Temperature  
540           555  

Rod 3  
Surface Temperature   Centerline Temperature  
567           559
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1 回答 1

3

您将逐行读取文件，然后跟踪最大值并在下一部分开始时输出这些最大值：

with open('ctf_output.txt', 'r') as temps, open(outputfilename, 'w') as output:
    surface_max = centerline_max = None
    for line in temps:
        if line.startswith('Rod'):
            # start of new section
            if surface_max is not None or centerline_max is not None:
                # write maximum for previous section
                output.write('{}\t\t\t{}\n\n'.format(surface_max, centerline_max))
            # write out this line and the next to the output file
            output.write(line)
            output.write(next(temps, ''))
            # reset maxima
            surface_max = centerline_max = 0
        elif line.strip():
            # temperature line; read temperatures and track maxima
            surface, centerline = [int(t) for t in line.split()]
            if surface > surface_max:
                surface_max = surface
            if centerline > centerline_max:
                centerline_max = centerline
    if surface_max or centerline_max:
        # write out last maxima
        output.write('{}\t\t\t{}\n'.format(surface_max, centerline_max))

输出使用 3 个选项卡，就像您的输入一样。

对于您的示例输入，它写道：

Rod 1  
Surface Temperature Centerline Temperature  
535         525

Rod 2  
Surface Temperature   Centerline Temperature  
540         555

Rod 3
Surface Temperature   Centerline Temperature  
567         559
于 2013-04-10T18:54:51.457 回答