python - 下载并解压内存中的gzip压缩文件？

Question

我想使用 urllib 下载一个文件，并在保存前解压内存中的文件。

这就是我现在拥有的:

response = urllib2.urlopen(baseURL + filename)
compressedFile = StringIO.StringIO()
compressedFile.write(response.read())
decompressedFile = gzip.GzipFile(fileobj=compressedFile, mode='rb')
outfile = open(outFilePath, 'w')
outfile.write(decompressedFile.read())

这最终会写入空文件。我怎样才能达到我所追求的目标？

更新答案:

#! /usr/bin/env python2
import urllib2
import StringIO
import gzip

baseURL = "https://www.kernel.org/pub/linux/docs/man-pages/"        
# check filename: it may change over time, due to new updates
filename = "man-pages-5.00.tar.gz" 
outFilePath = filename[:-3]

response = urllib2.urlopen(baseURL + filename)
compressedFile = StringIO.StringIO(response.read())
decompressedFile = gzip.GzipFile(fileobj=compressedFile)

with open(outFilePath, 'w') as outfile:
    outfile.write(decompressedFile.read())

Answer 1

您需要在写入 compressedFile 之后但在将其传递给 gzip.GzipFile() 之前寻找它的开头。否则它将被 gzip 模块从末尾读取，并显示为一个空文件。见下文:

#! /usr/bin/env python
import urllib2
import StringIO
import gzip

baseURL = "https://www.kernel.org/pub/linux/docs/man-pages/"
filename = "man-pages-3.34.tar.gz"
outFilePath = "man-pages-3.34.tar"

response = urllib2.urlopen(baseURL + filename)
compressedFile = StringIO.StringIO()
compressedFile.write(response.read())
#
# Set the file's current position to the beginning
# of the file so that gzip.GzipFile can read
# its contents from the top.
#
compressedFile.seek(0)

decompressedFile = gzip.GzipFile(fileobj=compressedFile, mode='rb')

with open(outFilePath, 'w') as outfile:
    outfile.write(decompressedFile.read())