[New-bugs-announce] [issue11608] GzipFile cannot be used for streaming

Enrico Zini report at bugs.python.org
Sat Mar 19 17:18:50 CET 2011

New submission from Enrico Zini <enrico at enricozini.org>:


this snippet does not work, because GzipFile wants a file-like object that can do tell() and seek():


import gzip
from urllib import urlopen

zfd = urlopen("http://ftp.debian.org/debian/dists/sid/Contents-udeb.gz")
fd = gzip.GzipFile(fileobj=zfd, mode="r")
for line in fd:

It must be possible to build a decompressing file-like object wrapper that can do without seeking, since it is obviously not a limitation of gzip decompression libraries. It would be extremely useful to have such a thing, as shown in the example snippet above.

Some more details (including a very annoying misrepresentation of the issue found in Dive Into Python) can be found at http://www.enricozini.org/2011/cazzeggio/python-gzip/ (I apologise about the ranting tone of the post).

components: Library (Lib)
messages: 131427
nosy: enrico
priority: normal
severity: normal
status: open
title: GzipFile cannot be used for streaming
type: behavior
versions: Python 2.5, Python 2.6, Python 3.1

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