unpickling derived LogRecord in python 2.7 from python2.6

Vinay Sajip vinay_sajip at yahoo.co.uk
Wed Apr 27 22:39:08 CEST 2011


On Apr 27, 5:41 pm, Peter Otten <__pete... at web.de> wrote:

> The Problem is that as of Python 2.7logging.LogRecord has become a newstyle
> class which is pickled/unpickled differently. I don't know if there is an
> official way to do the conversion, but here's what I've hacked up.
> The script can read pickles written with 2.6 in 2.7, but not the other way
> round.
> [code snipped]

I don't know about "official", but another way of doing this is to
pickle just the LogRecord's __dict__ and send that over the wire. The
logging package contains a function makeLogRecord(d) where d is a
dict.

This is the approach used by the examples in the library documentation
which pickle events for sending across a network:

http://docs.python.org/howto/logging-cookbook.html#sending-and-receiving-logging-events-across-a-network

The built-in SocketHandler pickles the LogRecord's __dict__ rather
than the LogRecord itself, precisely because of the improved
interoperability over pickling the instance directly.

Regards,

Vinay Sajip



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