473,603 Members | 2,652 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

read zipfile sequentially?

I have a large ASCII data set that is zipped to a reasonable size.
Can I access the data without decompressing the whole file first?
I would like to run through the data to produce a much smaller
extract and some summary statistics, but without unzipping
it (if that is even possible).
Alan Isaac
Oct 15 '08 #1
2 1138
I have a large ASCII data set that is zipped to a reasonable size.
Can I access the data without decompressing the whole file first?
I would like to run through the data to produce a much smaller
extract and some summary statistics, but without unzipping
it (if that is even possible).
Yes, if you're willing to slightly hack your install if you're
running pre-2.6 Python.

I had the same question, and Gabriel suggested[2] I try dropping
the 2.6 version of zipfile.py in my $PYTHONPATH so it's found
before the existing version.

Once available, you can use the ZipFile.open() method which has
an iterator you can use rather than reading the entire content
into memory. You can read through the thread for further details.

Works on My Machine(tm)[3]





Oct 15 '08 #2
On 10/15/2008 3:13 PM Tim Chase apparently wrote:
Ask and ye shall receive...
Thank you!
Alan Isaac
Oct 15 '08 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

by: Tung Wai Yip | last post by:
Can I add empty directory using zipfile? When I try to add a directory it complains that it is not a file. tung
by: Guyon Morée | last post by:
what is the difference? if I open a text file in binary (rb) mode, it doesn't matter... the read() output is the same.
by: Ian Cook | last post by:
Hi, I'm new to python so please excuse me if this is a 'dumb' question. I want to use the ZipFile module to UPDATE, rather than append, or create a new zip file. Does anyone know how this can be done? This is a snippet of the code I have now..
by: Waitman Gobble | last post by:
Hello, I am new to Python. I am having trouble with zipfile.py. On a Linux machine with python 2.4.2 I have trouble opening a zipfile. Python is complaining about the bit where it does a seek(-22,2). Looks to me like zipfile.py is trying to come back 22 bytes from the end of file. # python
by: Waguy | last post by:
Hi all, I am new to python and want to create a process to unzip large numbers of zip files I get from a SOAP application. The files all have a ZIP extention and can be unzipped using WinZip. However when I try opening the files using zlib or zipfile modules I get the following error: Traceback (most recent call last):
by: bvdet | last post by:
Following is an example that may provide a solution to you: """ Function makeArchive is a wrapper for the Python class zipfile.ZipFile 'fileList' is a list of file names - full path each name 'archive' is the file name for the archive with a full path """ import zipfile, os def makeArchive(fileList, archive):
by: flebber | last post by:
I was working at creating a simple program that would read the content of a playlist file( in this case *.k3b") and write it out . the compressed "*.k3b" file has two file and the one I was trying to read was maindata.xml . I cannot however seem to use the gzip module correctly. Have tried the program 2 ways for no success, any ideas would be appreciated. Attempt 1 #!/usr/bin/python
by: Kevin Ar18 | last post by:
I posted this on the forum, but nobody seems to know the solution: http://python-forum.org/py/viewtopic.php?t=5230 I have a zip file that is several GB in size, and one of the files inside of it is several GB in size. When it comes time to read the 5+GB file from inside the zip file, it fails with the following error: File "...\zipfile.py", line 491, in read bytes = self.fp.read(zinfo.compress_size) OverflowError: long it too large to...
by: John Machin | last post by:
On Jun 4, 8:06 pm, jwesonga <crazylun...@gmail.comwrote: Nothing is ever as it seems. Let's try to work backwards from the error message ... and we don't need your magnificent script, just the traceback will do for now, so: The error says that you are trying to seek 22 bytes backwards from the
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.