如何跳转到巨大文本文件中的特定行? [英] How to jump to a particular line in a huge text file?

问题描述

是否有以下代码的替代方案:

Are there any alternatives to the code below:

startFromLine = 141978 # or whatever line I need to jump to

urlsfile = open(filename, "rb", 0)

linesCounter = 1

for line in urlsfile:
    if linesCounter > startFromLine:
        DoSomethingWithThisLine(line)

    linesCounter += 1

如果我正在处理一个巨大的文本文件 (~15MB)，其中包含未知但长度不同的行，并且需要跳转到我事先知道的特定行?当我知道我至少可以忽略文件的前半部分时，我通过一个一个地处理它们而感到难过.如果有的话，寻找更优雅的解决方案.

If I'm processing a huge text file (~15MB) with lines of unknown but different length, and need to jump to a particular line which number I know in advance? I feel bad by processing them one by one when I know I could ignore at least first half of the file. Looking for more elegant solution if there is any.

推荐答案

linecache:

linecache 模块允许从 Python 源文件中获取任何行，同时尝试使用缓存进行内部优化，这是从单个文件中读取多行的常见情况.这由 traceback 使用用于检索源行以包含在格式化回溯中的模块...

The linecache module allows one to get any line from a Python source file, while attempting to optimize internally, using a cache, the common case where many lines are read from a single file. This is used by the traceback module to retrieve source lines for inclusion in the formatted traceback...

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