如何确定Python中压缩文件的内容长度? [英] How to determine the Content-Length of a gzipped file in Python?

问题描述

我的压缩文件很大，我想知道内容的大小而不解压缩.我已经尝试过了:

I've a big compressed file and I want to know the size of the content without uncompress it. I've tried this:

import gzip
import os

with gzip.open(data_file) as f:
          f.seek(0, os.SEEK_END)
          size = f.tell()

但我收到此错误

ValueError: Seek from end not supported 

我该怎么办?

谢谢.

推荐答案

要进行总结，我需要打开巨大的压缩文件(> 4GB)，以便Dan的技术无法正常工作，并且我想要长度(行数)文件，因此Mark Adler的技术不合适.

To summerize, I need to open huges compressed files (> 4GB) so the technique of Dan won't work and I want the length (number of line) of the file so the technique of Mark Adler is not appropriate.

最终，我找到了针对未压缩文件的解决方案(不是最优化的，但它可以工作！)，可以轻松地将其转换为压缩文件:

Eventually, I found for uncompressed files a solution( not the most optimized but it works!) which can be transposed easily to compressed files:

size = 0

with gzip.open(data_file) as f:
  for line in f:
    size+= 1
    pass

return size

谢谢大家，这个论坛的人们非常有效！

Thank you all, people in this forum are very effective!

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