我想使用 urllib 下载文件并在保存之前将文件解压缩到内存中。
这就是我现在所拥有的：
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。我怎样才能实现我所追求的目标？
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())
你需要寻找开始compressedFile在写入之后但在将其传递给之前gzip.GzipFile()。否则将从末尾读取gzip模块并将显示为一个空文件。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())
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