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Python 如何连续阅读细节块并计算文本行数

python python-2.7

Python 如何连续阅读细节块并计算文本行数,python,python-2.7,Python,Python 2.7,是否可以在此代码中添加while循环？因此，它可以不断地获取行块，直到它仍然可以看到起始字和结束字 with open('test.txt') as input_data: for line in input_data: if line.strip() == 'Start': break for line in input_data: if line.strip() == 'End': break

是否可以在此代码中添加while循环？因此，它可以不断地获取行块，直到它仍然可以看到起始字和结束字

with open('test.txt') as input_data:
    for line in input_data:
        if line.strip() == 'Start': 
            break
    for line in input_data: 
        if line.strip() == 'End':
            break
        print line
如果你是根据我的文本文件，我需要得到的数据从视频字符串开始，直到音频字符串。然后从音频到MKV。它应该一直持续到文件结束。这是我的文件样本

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VIDEO

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MKV

05-05-2017_00:35:15:677036
*****END OF YOUTUBE*****
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VIDEO

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MKV


05-05-2017_00:36:24:569523
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VIDEO

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MKV


05-05-2017_00:35:15:677036
*****END OF YOUTUBE*****
实际文件比这个文件长。 在获得行块后，我想计算具有百分比等数据的实例数。就像从视频到音频的第一个块一样，它有17行

示例输出

Video to Audio
Count = 17

Audio to MKV
Count = 14

Video to Audio
Count = 17

Audio to MKV
Count = 14

Video to Audio
Count = 61

Audio to MKV
Count = 23
然后它再次重复，直到文件结束，所以应该

最终样本输出

Video to Audio
Count = 17

Audio to MKV
Count = 14

Video to Audio
Count = 17

Audio to MKV
Count = 14

Video to Audio
Count = 61

Audio to MKV
Count = 23
下面是一个只处理一次文件的示例（它不使用while循环，但可以将其转换为一个看起来更难看的循环）

下面是一个使用字符串的
find
方法的解决方案：

您给出的字符串作为示例：

string = """
*****START OF YOUTUBE*****

VIDEO

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AUDIO

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[download] 100.0% of 2.99MiB at 897.53KiB/s ETA 00:00
[download] 100% of 2.99MiB in 00:03
MKV

05-05-2017_00:35:15:677036
*****END OF YOUTUBE*****
*****START OF YOUTUBE*****

VIDEO

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AUDIO

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MKV


05-05-2017_00:36:24:569523
*****END OF YOUTUBE*****
*****START OF YOUTUBE*****

VIDEO

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MKV


05-05-2017_00:35:15:677036
*****END OF YOUTUBE*****
"""
实际解决方案：

audio_indexes = []
video_indexes = []
mkv_indexes = []
audios = string.find("AUDIO")
while audios > 0:
    audio_indexes.append(audios)
    audios = string.find("AUDIO", audios+len("AUDIO"))
videos = string.find("VIDEO")
while videos > 0:
    video_indexes.append(videos)
    videos = string.find("VIDEO", videos+len("VIDEO"))
mkv = string.find("MKV")
while mkv > 0:
    mkv_indexes.append(mkv)
    mkv = string.find("MKV", mkv+len("MKV"))

for i, k in enumerate(video_indexes):
    print("Video to Audio: %d" % string[k:audio_indexes[i]].count('[download]'))
for i, k in enumerate(audio_indexes):
    print("Audio to MKV: %d" % string[k:mkv_indexes[i]].count('[download]'))
输出：

Video to Audio: 17
Video to Audio: 61
Video to Audio: 17
Audio to MKV: 14
Audio to MKV: 23
Audio to MKV: 14
当然，您可以更改这些文件的打印顺序。

如果您希望对数据集进行任何其他分析，我的解决方案将处理大型输入文件，并提供方便的数据结构

from __future__ import print_function


def parse_file(f):
    """
    Parse file into sections by walking the through the file and extracting counts.

    Returns a list of tuples (START_WORD, END_WORD, LINE_COUNT)

    :param f: Input file
    :returns: List of tuples
    """
    results = []
    current_block = None
    current_section = None
    line_counter = 0

    for line in f:
        if 'START' in line:
            # Start of a block create a new block and clear section
            current_block = []
            current_section = None

        elif 'END' in line:
            # End of a block, append the current one to the result list
            results.append(current_block)

        elif '[download]' in line:
            line_counter += 1

        else:
            # Handle video/audio/mkv section counts
            line = line.strip()
            if line in ('VIDEO', 'AUDIO', 'MKV'):
                if current_section:
                    current_block.append((current_section, line, line_counter))
                current_section = line
                line_counter = 0

    return results


# Input data is expected to be in *data.txt*
with open('data.txt') as f:
    results = parse_file(f)

    for block in results:
        for start, end, count in block:
            print("{} to {}\nCount = {}\n".format(start.title(), end.title(), count))
你能举一个你期望得到的输出的例子吗？@Tim Hi我编辑了我的帖子，这样你就可以看到示例输出。所以它只从一个块停止？如何获取文件中的其他块。