473,405 Members | 2,262 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,405 software developers and data experts.

shelve and concurrency

The standard library says:
"""
The shelve module does not support concurrent read/write access to
shelved objects. (Multiple simultaneous read accesses are safe.) When a
program has a shelf open for writing, no other program should have it
open for reading or writing.
"""

But what about threads? If a single program open a shelve and many
threads
try to write simultaneously to it, do I get an error? I would say yes,
but after various attempts, I cannot get it, at least on Linux, where
shelve is using dbhash as database. Can somebody share any light,
please?

Michele Simionato

Jul 18 '05 #1
0 1076

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

Similar topics

6
by: Rami A. Kishek | last post by:
Hi - this mysterious behavior with shelve is just about to kill me. I hope someone here can shed some light. First of all, I have this piece of code which uses shelve to save instances of some...
1
by: Kris Caselden | last post by:
Python's docs say that Shelve uses Pickle to serialize its data. However, I've noticed that Pickle can maintain internal links, while Shelve cannot. For instance: >>> d =...
0
by: seth | last post by:
Last week I encountered an AttributeError in my unit tests that I wasn'table to catch with an "except AttributeError" statement. The problem stemmed from a class that raised an error inside...
0
by: ex laguna | last post by:
Hi, I have ran into a problem with py2exe 0.5.0 and shelve in python 2.3.3. The script works fine standalone, but not with py2exe. Does anyone have a solution of workaround for this? Thanks...
0
by: Ray O | last post by:
I have read a number of threads relating to problems with shelve, but I couldn't find one directly related my experience, so I would appreciate some advice. The closest one ended with a...
3
by: Michele Petrazzo | last post by:
Hi, I'm trying a script on a debian 3.1 that has problems on shelve library. The same script work well on a fedora 2 and I don't know why it create this problem on debian: #extract from my code...
13
by: 7stud | last post by:
test1.py: -------------------- import shelve s = shelve.open("/Users/me/2testing/dir1/aaa.txt") s = "red" s.close() --------output:------ $ python test1.py
5
by: gluckj | last post by:
Hi, I'm not a Win ME fan myself (I'm a Mac user), but I'm here in Thailand developing software for special-needs kids, and the test PC in my home office is a Win ME machine (sigh). So when I...
1
by: Matthew Schibler | last post by:
I'm a newbie to Python, with some experience using perl (where I used nested arrays and hashes extensively). I am building a script in python for a MUD I play, and I want to use the shelve module...
0
by: Charles Arthur | last post by:
How do i turn on java script on a villaon, callus and itel keypad mobile phone
0
by: emmanuelkatto | last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud. Please let me know. Thanks! Emmanuel
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
1
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
1
by: Sonnysonu | last post by:
This is the data of csv file 1 2 3 1 2 3 1 2 3 1 2 3 2 3 2 3 3 the lengths should be different i have to store the data by column-wise with in the specific length. suppose the i have to...
0
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...
0
tracyyun
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...
0
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing,...
0
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new...

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.