Latest recipes tagged "handler"

Trap KeyboardInterrupt and EOFError for graceful program termination (Python)

2016-11-13T20:17:03-08:00

Python recipe 580718 by Vasudev Ram (ascii, error, exception, handler, shutdown, terminate, utilities, utility).

This recipe shows how to trap the KeyboardInterrupt and EOFError Python exceptions so that they do not crash your program. As a vehicle to show this, it uses a small Python utility that shows the ASCII code for any ASCII character you type.

RecursionError exception: concise and informative output (Python)

2015-07-05T23:46:59-07:00

Python recipe 578660 by elazar (debugging, exception, handler, recursion). Revision 3.

Replaces the default exception hook with one that, upon "infinite recursion", removes the last cycle. This results in a significantly cleaner and shorter error message.

Usage: simply import <module> as _

For more details see the descussion here: https://mail.python.org/pipermail/python-ideas/2013-September/023190.html

Cosign Handler (Python)

2012-07-18T13:30:10-07:00

Python recipe 578217 by Colin Higgs (authentication, cosign, handler, urllib).

Handler (python 3.x urllib.request style) for web pages where cosign authentication is required.

See http://weblogin.org/ for details of the cosign authentication system.

Multiprocess-safe logging file-handler + interprocess RLock (Python)

2010-09-22T17:30:10-07:00

Python recipe 577395 by Jan Kaliszewski (concurrency, file, file_lock, flock, handler, logging, process, rlock, threading, threadsafe). Revision 11.

A Python 2.x/3.x-compatibile multiprocess-safe logging file-handler (logging.FileHandler replacement, designed for logging to a single file from multiple independent processes) together with a simple interprocess recursive lock -- universal abstract classes + Unix/Linux implementation.

Update: It's is a deeply revised version. Especially, now it --

is Python 2.4, 2.5, 2.6, 3.1 -compatibile (previously Py>=2.6 was needed); probably works also with 2.7, 3.0 and 3.2 (but not tested if it does);
is multiprocess-safe as well as thread-safe (proviously thread safety within a process was missed);
is based on public interfaces only (previously FileHandler._open() was called and overriden);
implement full RLock instance interface, as documented for threading.RLock (previously non-blocking mode and context-manager interface were missing).

The module contains:

Unix/Linux-only example implementation (with flock-based locking): FLockRLock and FLockFileHandler classes.
universal abstract classes -- which may be useful at developing implementation for non-Unix platforms: MultiprocessRLock, MultiprocessFileHandler, LockedFileHandler,

Also a quick-and-dirty test was added.

It is still an alpha version -- I'll be very grateful for any feedback.

Further updates:

2010-09-20: Some corrections, especially: non-blocking mode bug in MultiprocessRLock.acquire() fixed; _test() function improved; plus fixes in the description below.
2010-09-22: _test() improved and moved to description section. Mistaken copyright-notice removed.